Gaylighting

A specific type of gaslighting. When you know someone is clearly gay, but they're in the closet. Everyone you talk to about it will gaylight you by saying they are clearly straight. Typically this is done to protect the closet person from harassment.

John: I don’t know why Kyle flirts with girls so much. He’s clearly gay.
Mike: No he’s not. He has a wife and kids.
John: You need to stop gaylighting me. I know what you two did last summer.