I can't think of a single reason why a stupid 19 year old girl would not annoy a snobby intellectual wannabe yuppie like myself. Which is why they annoy me.
Luckily I have friends who are sufficiently shallow that they can naturally relate to such girls, I just keep drinking to the point of not being able to finish a complete though, and then I can't get annoyed any more.
I also stopped trying to get girls' numbers, I grab a pen from the bar and write my cell on the back of my business card. They can call me if they want.