I love you dmiles but seriously, you need to stop here. He's wrong, you're right. But that doesn't matter. You're giving him everything he wants by making this as personal as you are. It doesn't matter that you aren't cherry picking -- as you noted your relative went to the school. Cherry picking doesn't count when you have a connection to a school like that. But he doesn't care and he's just trying to torment you. And he's winning.
What was said about you wasn't that bad. Even if it was, it is the internet -- who cares. And even if by chance you did care, you shouldn't be giving him the satisfaction that you are.
He has said hardly anything to you. And has probably kicked back and laughed as you've overreacted to everything he's done.
9/13 -- he makes one comment about "stealing" another team. You respond not once, but twice that day. And then you respond once more the next morning. You've pretty much let him know that he's in your head.
9/15 -- he criticizes you as being unable to recruit. You make 6(!) posts in response to it. Do you think at this point he's not going to needle you more? You are begging for it.
9/16 -- he brings up the fact that your coaching profile currently has a poor reputation. You are smart and just reply once but you mention you are getting sick of it. Begging for yet another post that will get under your skin.
9/18 -- One more post and two more comments by you.
At this point, he's used 83 words. You've used 844. (And yes I put the posts into Word to get a count -- as much as I side with you on this, even I'm finding it funny how much you are overreacting.) When he knows that for every word he posts, he's going to get 10 angry words out of you in response, why wouldn't he make posts like he has.
And then it appears you spent your entire Friday night trying to convince this message board that he's a jerk and that you didn't cherry pick. I hope he doesn't read the forum because if he does, he's won yet again.
Just stop posting. If he posts again, ignore it. The worst thing that you can do is to continue what you have been -- show that you're upset, type way too many words demonstrating how he's under your skin, and refuse to let him go away.