I think the problem I have with it is that it's not that he makes these tweets, but that he lacks the self control not to do it. He also gets butt hurt so easily by things said on the internet. I hope the guy has his breakthrough year this season, but for crimety sake, can't you just not tweet for a week?
His tweet about the Dolphins saying he was guaranteeing a win is so transparent that it's ridiculous. If he wanted to know that information, I'm sure he knows someone in the league who could find it out for him without making a public display out of it.