Think of it this way, you've just met a nice, attractive girl and you're going on a first date. Maybe a casual dinner. Obviously, there's going to be an opportunity to share information on the things that you like. Citing the previous examples, chess might be a hard sell. If you're passionate enough, this shouldn't be a deal breaker. Enjoying music is something that will probably get her attention. You could say you like baseball, and even if she's not a fan, she could understand/appreciate it. Then, try explaining to her about fantasy leagues, Fangraphs, the optimal version of WAR, maintaining Excel spreadsheets on salaries with hypothetical lineups projected out until 2023.
It's not difficult to envision what sort of reaction this might elicit. At that point, it wouldn't be very subjective!