It is absolutely possible to notice a pattern of genre preferences.
Agreed. Yes, I have noticed many patterns of genre preferences in others. The most common pattern I've noticed is the homophobic a person is, the more they love macho-seeming movies, and more likely to be secretly doubting their own sexuality. What does that have to do with disagreeing with me?
I have a hard time believing that you are truly, utterly agnostic to all data points and extrapolations.
Also correct. What does that have to do with the fact that I am truly, utterly agnostic to genre preferences?
I like the Avengers. But it doesn't shock me when somebody just isn't a fan of the superhero movie genre. I don't like sports movies. I suppose it's hypothetically possible that a really great one could come out, but I'd bet against it.
(I'm a bit skeptical of calling Firefly a Western, even if the producers called it that -- but then, I don't know that I really have a good handle on what a Western actually is).
It sounds to me like it's time for a John Ford deep dive for you. Maybe a little Sam Peckinpah. It's totally worth it, and will inform your views on other genres.
The sports movie thing may come over time. They certainly aren't all good, but sample the boxing subgenre (The Set-up, Rocky, Raging Bull) before writing the entire genre off. Personally, I love a good formula sports movie as an easily-accessible bit of pastime that can be shared with others. Hoosiers, Rudy, and and The Worlds Fastest Indian come to mind as movies that have served to entertain the whole room in recent years at my house.
Again, let me assert, arbitrary genre preferences are a burden to YOURSELF and others. Especially true for those of you thinking about being filmmakers.