That really sucks, but don't deprive yourself of something you think you might enjoy because of that one jackass. Chances are that next time you won't experience something like that.

Also, basically every pro and semi-pro sports stadium nowadays has cell-phone-contactable security that you can summon to handle situations like these. The threat of being kicked out of his $250 seats is way more of a threat than that of being confronted by a "mega-nerd".

I wouldn't make a habit of contacting security over every little annoyance, but if they're obnoxiously blocking an old lady, that's the time to use it.

P.S.: your karma is currently 1337, sweet