My issue is the back chat, abuse and excuses you get when you ask people to please not do something and explain why.
Yes, that's my issue too. The lack of knowledge isn't, the attitudes I've been met with and the audacity of people to tell owners to mind their own business, or call them names.
If it were genuinely based in welfare, then they'd listen, but unfortunately some people don't like to find out they're wrong, no matter how nicely you point it out.
I had a laminitic greedy Shetland 'back in the day' for my DD. He was a Houdini as well and so the fences were bloomin good because if they weren't he was out and could you hell as like catch him. The yard I was at at the time had a visit from the rscpa regarding a pony being starved, and he wore a muzzle during the day, off at night. They visited, spoke to the yo, who gave them my details and the general overview. They saw said pony, spoke to me and the vet and went away happy.
I hold absolutely no malice to that person, they were concerned, it wasn't malicious because the report was only made once (I'm not sure if the RSPCA give feedback or not) and they did the right thing by reporting it to someone who does know what they're talking about.
The others that took it upon themselves to remove his muzzle and feed him, allowing him free access to the grass (sparse as it was) I have an issue with, he spent another 2 weeks on box rest and I got to pay out for another vet visit and more medication.
And I had a sign up too. No it didn't detail every possible outcome from removing his muzzle and feeding him, it asked politely for people to leave him alone because he was recuperating from illness.
As another poster said, I'm always happy to talk horses, it's one of the things my non horsey family and friends complain about in fact! But my experience tells me that many people don't want to know, they don't want to listen about how what they're doing can be harmful. They just want to do it.
I don't know the answer to this, I really don't.
Can I feed them grass?
Personally I wouldn't want you to feed my horse grass, especially from the side of the field or grass verge etc. I monitor my horses field for poisonous plants, there may be some in the grass you pick to feed, or it may have been sprayed with something. I could then end up with a sick horse and no idea what's wrong with it, which takes longer to diagnose and treat for the vet, putting the horse in danger.
And hand feeding can cause issues, horses can and often do, fight over a food source. By feeding them grass, or anything, not in a controlled environment, you become that food source. They can start to argue with each other and you can get caught in the crossfire, or they can injure each other. Hand feeding also encourages some horses to bite, I don't hand feed mine for that reason. I've taught him not to bite, but people feeding him anything from the hand undoes that training, because effectively they're teaching him that the behaviour gets a reward.
The horse may also have issues with teeth that means only short grass is suitable, or is on restricted grazing for health reasons. One handful of long grass could choke the former, and several people doing it can cause health issues for the latter.
So no, it's best not to unless you've got the owners permission.