This is why I quit going to a gym for 4 years...
The one I go to now is so low key and none of the people (or maybe a couple) seem to care about any of this stuff. The people who go to spin are mostly not cyclists at all, which astounded me, in that they aren't even "spin" people. It's a rag tag group that is much more fun than the the ones at the snooty gym I used to go to. I haven't been to spin in about 4 weeks, since it's perfectly fine for riding outside, but I am sure nothing will change.
They'll all be spinning with no resistance on their bike, no water, wearing cotton T shirts.
Don't I sound like a bike snob? It's all so silly that people get angry over this stuff. The gym management should set the rules.
And another reason why I don't teach at gyms anymore.