I spoke to a friend of mine who is a bartender, who grimly told me that when it comes to an establishment that serves alcohol, they bouncers are allowed to kick out whoever they want. My bartender friend then told me another story along the same lines, where two friends of his were waiting to get into a bar and were turned away at the door because they were men. I asked my bartender friend if they could be sued for this, and he said no, because of the above-mentioned rule. I then asked if they could turn away all whites at a mainly black club, or vice-versa, and he shrugged. It seems that if there is alcohol involved, anyone can be discriminated against.
Sex is a very gray issue, cause of the stereotype of men getting more drunk and rowdy than women.