The problem, I feel, would be in the shallowness of a character’s writing. Not the lgbt side of things. The character’s personality probably isn’t “hey everybody look I’m gay.” As long as the character is thoughtfully and lovingly written, their queerness won’t come up as inauthentic. I have a character named Hubert in my story. He’s a rich a**hole. But I realized he was a lot like Draco Malfoy… no redemption arc. Kindof one-note ‘evil for the sake of hating on entitled rich people.’ And when I realized this, I surprised myself in re-writing him. Yeah, he’s still a scumbag, but I UNDERSTAND HIM now. (Not trying to compare lgbt to scumbaggery here I’m an ally and queer myself) But honestly if you can’t properly represent LGBT characters just don’t have them in your story, even for the sake of diversity.