DH called me a vile, nasty piece of work

But as the parent that is for OP to decide. She gets to decide because she is the parent. And getting him out of the house when he hasn’t for some time is looking after him just as is getting teeth brushed etc.
And why is this the point you’re picking up on? Why are you so keen to criticise the OP and not her husband’s behaviour? Isn’t that more the issue?

they are meant to get 20 minutes of sunshine daily for vitamin D. As a parent you have a duty to look after his health.

I agree. I had my leg in a full length cast many years ago, and I got absolutely stir crazy after a couple of weeks.

There were times when I'd have paid good money for someone to take me the park for an hour or two.

Weird question. What is the relevance

It’s the vibrations that are the issue.
You billed this as something “nice” would you consider 20 minutes of avoidable pain “nice” all so you can sit on a bench outside do the same things you were doing at home?

He has torn or detached a ligament, moving around can actually stop it from knitting and healing properly. The vibrations from a car ride can also be very painful. The only movements he has to do are any physio prescribed.

Those are not comparable. A spin in the car and going to the park for something “nice” to do is subjective and not an essential life task like brushing your teeth or getting homework done.

Childrens’ wishes should always be solicited and considered. The older they get, the more weight their wishes should have especially when the OP’s stated objective was to do something “nice” as a family.

btw, I am not defending either OP or her DH, they acted horribly and said awful things to each other.

My point is the entire spat could have been avoided if she had simply listened when her DS was saying he did not want to go and that it is “OP’s way again” which is a pretty innocuous way to phrase things when objecting to being forced into an activity.

Instead she decided to initiate an argument with her DH along the lines of DS is parroting you, it’s your fault he thinks he can object to going,

DS is a teenager, teenagers are pushing for autonomy and a say in things. Ofc they are going to raise objections in the way that has been role modelled for them by both their parents. As it is, the DS pointing out he is being forced to go, its not a nice idea for him and OP is getting her way again is not rude or worrying imho.

The DS behaved far better than both his parents.

Not sure you have the correct usage of "triggering" tbh as it is usually associated with upsetting memories being brought to mind due to a situation - but I can totally understand you being upset and annoyed at the disrespect being shown by your H and son.

So you do force your “suggestions” onto them.

Im not surprised they get sick of it, to be honest. I would also hate being dictated to on how I’m being made to spend my day.

"I’ll be honest, if I’d been chivvied along to sit on a bench in a park when I was a teenager on crutches, when I was perfectly happy chilling on the sofa with a book or a pile of VHS tapes of my favourite horror films, I would have been massively resentful too. He’s not a young child; just leave him at home. "

Even when injured or post op, people need to get up and move around. Complications from sitting around and not getting up and moving every so often can be things like muscle loss, blood clots, and pneumonia.

YANBU, your husband is a dickhead and regardless of context I’d be filing for a divorce if DH spoke to or about me like that.

That's not necessarily true. But that isn't what I was commenting on. You said that the other poster said that it was unbelievable, when that is not at all what she said.

It’s triggering me now that DS is parroting his Dad 🙄

What do you mean "it's triggering you"? Have you been in a previous abusive relationship where this has happened?

Or do you mean - it is really ruddy annoying me. If so, YANBU

Do you never make your kids do things they don’t want? Sometimes mine don’t want to brush their teeth or go to bed or do homework. But I “ride roughshod” because I’m the parent. And that’s what she’s doing- parenting.
You seem very keen to have a go at the OP and ignore how her husband and son speaks to her which is actually the point here.

So we should always follow what our kids want to do, and never overrule it in their best interests? Of course we should listen and take their wishes into account. But we don't always have to follow them.

And either way, it's unacceptable for her to be spoken to in that manner. It doesn't justify being called a "vile, horrible woman" by your husband in front of your kids. I'm surprised people are defending this.

You're saying that as if it's a bad thing to go outside and do things. Of course it's important to get out of the house. What is wrong with some people on here?

So long as he is doing his physio thats all the movement that matters. Riding in a car can actually hinder healing.

I don't see any harm in your dc being out in the fresh air. Kids will get a cob on about anything whatever you do. When I was on crutches the advice was to be as mobile as possible.
I think your dh needs to think hard about the behaviour he is modelling for your ds. It might help if you both had counselling to look at communication etc. If this behaviour isn't checked this will be how your ds treats women in his future relationships.
It never ceases to amaze me when men justify disrespectful/aggressive behaviour as 'just a joke' and make the problem the woman's sense of humour (or lack thereof - in their opinion). Jokes are supposed to be funny. If noone's laughing maybe not a joke, just bullying.

I think it's concerning that (a) he speaks like that at all and (b) he doesn't seem to think it's particularly serious (he started joking around and trying to make her laugh in the park).

I understand people saying things they regret in the heat of a massive row (and then apologising later) but this doesn't seem like that. This seems almost normalised. And the boys are learning it's ok to speak to women like that.

Someone needs to point out sharpish that this is not acceptable.

Open a window then. Fresh air is pretty polluted and over-rated. He is injured, in pain and just wants to rest and recover.

In the spat in the park between you and DH, what is being lost is you are riding rough shod over your eldest child’s wishes.

Taking our two children to the park this morning, our oldest has injured his leg and is on crutches-he hasn’t really left the house much since he hurt his leg (possible ligament damage) and is beginning to fester! I said it would be nice if he had a spin in the car and sat on a bench in the sun while his sibling played.

You thought it would be nice, but your eldest child didn't think this was nice at all.
So
It was a fight to get him off the couch and to leave the house and in the car he said “It’s (insert my first name’s) way again” etc

So instead of listening to your child and reflecting on hey maybe my great idea of a drive in the car and a family day in the park is a shit idea that only I want to do, you deflected by making what he said all about “parroting what your DH says” and a marital spat ensued.

I think YABU and it was your way or nothing at all. You didn't give your eldest DC a choice to stay home or choose an activity he could have partipated in or even have a conversation about what to do as a family. Nope, you decided what you wanted to do and everyone else was supposed to fall in like good little soldiers.

Sitting on a bench watching your sibling having fun is not nice at all.

Because the child is repeating behaviour and language his father uses. Therefore he has got it from home.