I'm not so sure. Lesbians are given some unique sexist crap, including from some gay men as well. I'm sure there will be some basement dwellers going "Korrasami need some good D to end this nonsense". Also, there is a young teen couple of gay superheroes in Marvel's Young Avengers team named Wiccan and Hulking where Wiccan has many similarities to an Aang or Frodo. So that's not completely an unprecedented situation as well.
BTW, just rewatching "Breath of Fresh Air", Book 3: Changes premiere. It's RIFE with subversive nods towards Korra and Asami's changing sexuality, what with the newly powered Airbenders having to accept their changing physiology and the impact it will have on their lives. It's like X-Men in Avatar-verse!