All I see is him being rude to others, but hey, I wont voice my opinion if all i get told is STFU -3- terribly sorry for having an opinion on the things he's said, friend or not, that wasnt nice, and you've done it to other people too. I quite agree that you need to stop and think about what you say, telling people that theyre trying to be cool by making meshes you've already made, or telling someone they're a copycat for making a map you had an idea on is NOT nice, and my opinion on this wont change no matter how many times you say STFU, which is also not mature, and not very nice at all.
So, in my opinion and in a sugestion, try to think about what you say in the future.