someone please explain this to me

ok i was at a show on saturday (at a christian venue)

one band was on stage and the lead singer said "if your having a good time give me a hell yea"

so some people said "hell yea"

then no more than 2 seconds later the people who work at the venue are on stage talking to them telling them no to say that

wtf?

since when is saying HELL a bad thing?