Just a small religion danger (dharam sankat)

A small conversation between me and my friend, some time ago after coming out of a night club.

Friend: Those black lights are great man. We should buy those when we party at home next. Just black lights.

Me: Yeah that would be cool. But after a few minutes of awe it really isn't that great. We can barely see and "black lights only" at home is NOT a good idea. By the way, think about it, "black light" ... oxymoron

Friend: (fuming, and visibly agitated) I am not a moron. You are a moron.

I just drove back in disbelief.