I was dating, and later engaged to, an Orioles fan. Not the same as the Yankees (not as bad), but she was a true die-hard. I've also dated a few Yankees fans, but only casually. As a Steelers and Red Wings fan, I have also as a consequence of my location dated a lot of Patriots and Bruins fans in the past. Bruins fans are alright, but seriously, Patriots fans are the absolute worst.