The show doesn't depict homosexuality, not because they don't support it, but because the show doesn't focus on sexuality at all, homo, hetero, or bi. They probably will do some sort of parable or something about differing beliefs and cultures, but don't count on an entire serious episode about political correctness. The show isn't about that kind of stuff.

Just because she's a tomboy and has a Rainbow Mane doesn't make her a lesbian… That's stereotypical.