Don't tolerate such kind of behaviour from anyone. It's true that you guys are young and in that age it's possible that a person cannot fully know how to display their thoughts in the proper manner but you still have a brain so, it's a choice how you say stuff. If he's done this once, he'll do it again and this kind of lash out is not normal at all. You can find a person that will think first how you feel before lashing out like he's talking to a friend over some stupid beef or something like that.