Is this rude from a child? Age 6, furious reaction from teacher

DISCLAIMER I'm going to assume that things happened as you/your child say.
Obviously you need to ask the teachers and get a clear picture of what happened.

But taken at face value, another teacher entering the room and shouting at a 6-year-old sounds like a bullying pile-on to me, and would be frightening to a small child.
A decent teacher would make a little joke of it, and/or spend a couple of minutes on why and how in pain and injured are the same and how they're not, rather than shut down a kid's thoughts and opinions on it.

He was wrong but maybe he is a smart alec and the school is strict.

All this talk of ‘screaming’ at a six year old! You can tell the posters who have never worked in a school!
I have. For many years.
Teaching staff sometimes need to use a firm assertive voice when children are misbehaving or whatever.
I once heard lots of messing about in the toilets (yr1 & 2’s in there. Went to have a look and one child was looking under the cubicle door and subsequently, the other kids were copying and doing the same. Kids being spied on were getting upset. Huge safeguarding issue. I used a firm voice to tell the children that it was totally inappropriate and took the ringleader to her class teacher and the other children to theirs. Cue the tears and apologies. Left the child with their teacher.
Child spoken to and explained it was inappropriate blah blah blah. End of.
The next day, the mother asked to speak to me and said how upset her child was and they were scared to come into school because I’d shouted at them (I didn’t) and that I should apologise to them! For being told not to look under toilet cubicle doors when others are using the toilet!
How about you tell your child that that behaviour is totally unacceptable?!!!
It’s parents like this that are resulting in school staff leaving in droves (I have) and children thinking they can do what on earth they like with no consequences.

Using a cross/assertive tone isn't shouting. Let's not pretend it is.

Maybe the child was thinking literally but not being cheeky

Some teachers are complete badtards

The point is that they in all likelihood haven’t been shouted at though. I don’t have primary experience, but teens often said I’d shouted at them when I’d spoken in a normal voice but firmly and saying something they didn’t like.

Kids don't view a cross/assertive tone is shouting because they've never been told no at home. They view it as shouting because they've not been shouted at. Which is how it should be. Let's not normalize shouting at six year olds.

And for all we know that has happened - colleagues do know each other well and support each other. We have the (second hand) story of a 6 year old who has shown little awareness of the situation - do we really think he would pick up on subtle words or body language between two adults, or has related it to his mum the OP.

That was the point I was making! A teacher friend said that the worst offender for thinking she could 'have a little word' every day was a doctors' receptionist who took offence when asked to ring and make an appointment to take her litany of complaints to the Head.

I don't see walking in to another teachers lesson and shouting as supportive, exactly the opposite in fact. Id look at the teacher and ask her if everything was ok.

I keep seeing this ‘asking a question’, ‘looking for clarification’ comment. Look at the OP. he didn’t ask a question. He tried to tell the teacher she was wrong, when she wasn’t. He was absolutely trying to show the teacher up, most likely for a laugh. If he’d asked it as a question he’d have said so to defend himself and the OP would have said so.

Id feel undermined, would be interesting to know what she/he thinks.

@MotherMary14 Perhaps but still OP should investigate and make it know how distressed her DS is because of the situation

Not saying the teacher wasn't stern or their voice didn't raise above a normal level, but I don't believe they were shouting (or screaming, as some of the more hyperbolic PP have claimed). In my experience kids will often say shouting to describe a grown up talking loudly.

Op why don't you ask one of the other children, rather than going straight to the teacher? You might get the middle ground version then.

in my experience small children don't tend to cry at bedtime over things that didn't happen

Same.

Yes you have a point there.

I still firmly believe this teacher probably only barely raised her voice.

@Calliopespa I agree with you. I said screaming because if a teacher continues to shout at a crying child I think they have lost control

In fairness I think there is a difference between screaming and shouting. The former implies a complete lack of control. Not saying shouting is good, but at least it could be intended as firmness.

The other thing is some kids seem to have no control over whether they what is in their head pops out of their mouth. So possibly he wasn’t being cheeky but not processing his thoughts in his head. Shouting at him is not the best way forward in any case, but it might be worth trying to tease out whether he wasn’t being cheeky / playing up or just not editing.

Because 6 year olds are not allowed developmentally ready for this rigidity. Absolutely will need to elaborate it at some point in their lives. In infants is not that point.

He was expressly told by the teacher not to talk, and the first thing he did was say something. Even if you think that the questioning wasn't rude in itself (I do think it very rude, as it happens) surely you can see that immediately doing the thing that the teacher told you not to do is disobedient and naughty.