Repression

It could be that you're feeling rebellious, or it could be that you're just not confident enough to stand up to your Mom in a knock down drag out arguement. That little one this morning will be nothing compared to what will await you tonight if you went home. After all you gotta live with her and she still commands a very intimidating presence. 18 years of indoctrination is hard to completely shake in one day.

Your sister suggests a club that doesn't check IDs, since she isn't eager to go home either, but she won't be staying at Butch's anymore.