Charging different prices for different people isn't illegal. It's the basis of ladies night.
What I want to know is how can you tell if someone is gay or not. People think I'm gay. I'm not. But there are people who keep telling me I should be true to myself. And I should. And I AM. Which is why boobs are just great. They just brighten your day. Just like "TA-DA!!! IT'S TITTIES!!!" and you make that public domain sound of the asian girl in amazement. WOWWWW!!!!!!
I think some cities/states have determined Ladies Nights to be illegal... after lawsuits from the exact same types of dudes who think a heterosexual awareness month are a good idea.