You can but then you need some other way to gatekeep because a community of trust has to have an inside and an outside. Someone needs to keep people who don’t belong out, for whatever value of “don’t belong” you want to build a community around.

What's classist about having behavioral rules?

What sort of behaviors are you referring to?

I wasn’t the one referring to behaviors.

But I bet a social club that rigorously enforced the rules of Mr. Roger’s Neighborhood would be more popular than anything goes.