(i.e. don't do like the soccer fans at the USMNT matches who stand up for the entire match).
Alot of sections close to the game at USMNT games are designated for that, if you don't like it, don't buy a seat there. I always make sure to buy those tickets so I can stand and sing.
Back to the regular thread though, I kind of find the current ushers to be overanxious to give paying fans are hard time. Like if someone's being drunk and obnoxious standing the whole game ok, but there's certain situations where it's more than reasonable to stand up and cheer, unfortunately most of our ushers lack any knowledge of the game to separate those situations.