This happens, really, all the time though.
Screamhouse (2002) got shutdown twice during the run to pull up an ambulance. We had people urinating in the house itself. One night, our nurse (an 18 year old girl) went home early because 3 different grown men had punched her in the face before she was halfway done with her second set. I reported a couple I saw literally setting an ambush for another scareactor.
Point being, this stuff has always happened. There have always been obnoxious teens and angry, violent drunks in attendance.
I think the big difference is that, now, scareactors can be far more vocal about what they put up with. In turn, fans are far more aware of it so they actually see it now.