[ubernostrum]

I'm grossed out at the sight of a crack

99.99% of the time what people actually mean by this is "I'm grossed out by seeing this on someone I find sexually unattractive". You may want to think through the actual consequences of trying to articulate that into a policy -- it goes to some genuinely (pun intended) ugly places.

[pubby]

I don't appreciate you putting words into my mouth.

Also, are you seriously arguing that showing butt cracks at public events should be an acceptable thing? I suppose you also think that people should be allowed to eat with their feet on the table, or cough without covering their mouths?

[ubernostrum]

Pants cut to deliberately ride low and expose either the top of the underwear or part of the cleft of the buttocks are not terribly unusual and when worn by a person of one's preferred sex and body type are quite often considered attractive. In fact, I believe Urban Dictionary lists a number of euphemistic ways to describe this phenomenon.

For all such people, do you feel repulsed? Do you confront them about the hygienic threat you perceive from their intergluteal clefts? Do you publicly shame them?

Or do you only do this when you observe low-riding pants on someone you find unattractive?

[elektromekatron]

Also, are you seriously arguing that showing butt cracks at public events should be an acceptable thing?

Have you seen the telly recently? Say, in the past 50 years?