- You see a guy and a girl walking down the street holding hands. "Oh, isn't that sweet? They're so in love! They look so happy together."
- You see two guys walking down the street holding hands. "That's weird, I feel sick. What's wrong with them? I wish they'd stop flaunting their sexuality!"
- You see two girls walking down the street holding hands. "They must be really good friends, how cute."
And we're only talking about holding hands here.
One instance is socially validated; one instance is viewed as morally repulsive; and the other is whitewashed so that it doesn't really exist.
Realistically, all three should just be treated the same.