I know that for the lightning it's only for certain expensive sections and for baseball it's largely only restricted to the seats immediately behind the plate.
And as desperate as it seems, they can ask people to remove shirts and if the.people don't want to, they can get the heave ho.
A company, for example, could not get three contiguous seats behind the plate and raise three signs " eat" "at" " joes" after every pitch.
I've been to games in hostile territory, a couple of barbs, a couple of drinks but it was fine.