The leftists I’ve met tended to study the Arts (English, sociology, history, etc) whereas the right wing types all studied math, engineering, computer science

Sure, maybe. I’ll point out that there’s a known statistical trend of more highly-educated people being more left-leaning, but I’ll leave that discussion there, because it’s not actually the point.

I didn’t actually say anything about nerds being leftists. I said that nerds are anti-sport. And that Lemmy is made up of nerds. Both of which, I hope, are not controversial statements. Not that Lemmy is made up of a representative cross-sample of nerds, but that of the users who are on Lemmy, most are nerds. My conjecture is that the reason you see a dislike for sport on Lemmy is not because Lemmings are left-wing, but because they’re nerds. And that if you were to control for political belief, Lemmy would still have a stronger anti-sport bias than the general public. While if you controlled for “nerdiness”, Lemmy’s anti-sport bias would be relatively weaker. Not an easy experiment to perform in practice, unfortunately.