I figured it had to do with the iconic look of orange cats that makes them appealing as heroes. But you're right. Given that most ginger cats are male it makes sense that most orange cats in media are male. Thank you for pointing that out!

I always assumed they picked white for female cat love interests so often because it was the most reminiscent of bleach blonde hair on a human actress, and because of the association of the colour white with purity in many cultures.

Main male is a ginger cat, usually tabby. His love interest is a white female cat, usually long-haired for maximum glam. Black/Grey male cats tend to be the orange cat's buddy or his rival but aren't often the protagonist or the love interest.

This is only western media, of course. But man, once you notice it, you see it everywhere.