My mom always told me to honk at the fat chicks, too - if for no other reason but to make them feel good about themselves. I have no idea why, but I never forgot that.
Anyway, a few years ago, I rolled with this guy who had a fetish for fat chicks. No matter where we went, he always looked for the FATTEST girl in the club and hit on her. And he was a fit guy. I don't get it, but I guess some things are better left unexplained.