I think you missed what i'm implying.
Even if HE wants to go crazy on you, flag and downvote everything you do, then can't you just be the bigger person and say "whatever"?
Calling him a bozo sure won't solve the problem, it will only make it worse.
I can't take up for his behavior because he is my friend, but I also can't excuse the fact that you're making the drama bigger than it should be.