Someone I know likes trashy girls?

This guy I know seems to always want to pursue girls from like the south side of town. I mean he;s in his late 20s but he has always dated black chicks in their 40s, white chicks who live in halfway homes, and also random ladies "from down the street". The common factor of all these women is that they are usually working some low-wage job, or not even employed at all. Heck one of them is a former addict, but Im not saying theyre all bad, just not at the same level as my buddy. This person I know is a college educated guy, and he is established at his job and comes from a middle cl family. Why does he choose to go after women "not at his level"?? Its been like this for 10 years almost.