I've had a real mix of responses now from stop pandering, he's a spoiled only child to I feel sorry for him you're trying to make him action man and he knows you hate him! Two extreme ends of the parenting spectrum!
WRT the rugby, I mentioned it as an example of when I've personally seen my Son with a face on hoping someone will notice and give him the ball. I don't actually care whether he plays a sport or not, he is fit and healthy/ gets outside anyway. He chose rugby, then after about a year and a half he chose to give it up, I just facilitate.
I will say though that rugby kids are not rough bullies, they spent over a year learning to tackle safely, me and my ds used to play tackling each other at that time at home, in the way they show you to and he loved it, but it's nothing like play fighting IMO, the moves are prescribed and predictable with the under 10's, they are still learning safe tackle and safe falling he found it fun, it was the keeping up to get the ball in the actual games he hated, he was just following the crowd, not getting near and didn't enjoy it. Also it was outside of school, not every boy in the playground plays rugby, I don't know if I gave that impression.
My aim isn't to get my Son play fighting or giggling while he is pounded around the playground, but when someone can't brush past him without him falling to the ground and looking at them in an accusatory way or telling the teacher then that is a problem. Not for me, I'm not there (although I have seen it and know that it happens) for my Son it is a problem, because he wants friends who want to play with him and that is not compatible with trying to make said friends feel guilty for silly things or getting them into trouble.
I've personally seen my ds behaving in the way that the parent described when he's been with other children, I've brought it up with a teacher before when I noticed a couple of his friends appeasing him, I thought it was unhealthy and would bite him in the future. The school friend whos mum I spoke to is a kid who does not play rough with my Son, my Son has said this himself, but I know the child feels sorry for him and spends more time with him so he is not alone, I think that is a problem.
I don't have a plan that I want ds to be with any particular group of kids, or similar to any particular group of kids, actually I think it would be a relief if he enjoyed his own company so everyone extra was just an extra!
If he played with the girls I would be happy, if he had a stock of male friends who weren't rough I'd be happy, if he was happy to play alone I'd be happy. None of these things are the case though, he is unhappy, he hates school.
I'm not naive enough to think that every other kid should have to change to fit my child's personality. It can't ALWAYS be everyone else.
I have complained about specific kids doing things this year, he was in a very cliquey friendship group of three and I thought the other two kids were horrible and undermining his confidence (things I had seen for myself), I pointed out to my DS their behaviours so he knew it wasn't him, he wasn't being left out because he wasn't good enough it was power play.
I'm grateful for the advice about helping him to be more positive, because I'd hope it may turn to him feeling more positive at the time of something happening and overlooking minor things, being more indifferent to them. Tbh though it's not so much about him acting differently at home, it's because the way he acts in school affects how he is seen and treated and then how he feels about school and friends.
I don't want him to take the lack of confidence from not having many friends and feeling unwanted socially into secondary school with him, if he has another year like the last year then I think he will go to secondary with very little social confidence and then it's much harder to change, you lose the optimism, you start to approach new people like you think they probably won't like you. I know because that happened to me at the same age.