Sensitive or show some class and respect to the sport you supposedly are a fan of and the competitors trying to have an experience that is in the same vain. I've been to a lot of NCAA's now and can tell you I've never seen anyone that was ever any good at the sport act that way.
If shouting down other humans and degrading them is your thing, and apparently normal fun fan behavior, then by all means do it, after all, you paid your money. I will also defend your right to act that way, hey free country, party on Garth. But, it's total tool behavior. You may be in the category the OP is polling about and since you can't see it there's no point in further discussion.