worried about 6yr ds

[momwhereismy]

I am not sure is this right place to post. Apologies if not.
I am concerned about my son, he gets caught up on something and cannot leave things go. For example today, we were sitting on the couch, his foot got caught, his dad said pull your leg out no need to whine like a baby, all hell broke loose then. He shouted at his dad, now I mean roared at him. I asked him to go to his room, his face became all twisted, heavy breathing and fists clenched. I know he didn't like what his dad said but it was a complete over reaction. His dad would have apologised to him if given a chance! He went into his room shouting and roaring. Came back out, kicked something, told him I wouldn't speak to him until he could speak nicely to me. He eventually calmed and spoke to me but still was self righteous and wouldn't back down about his part in it. This is him whether its playing with a friend or playing with me or dad. Others day he can share and be so kind hearted. Is this normal for a 6 year old and if not where do I get help frpm