I think it's probably several different reasons but I think a big one is the fear of the unknown. Basically they hate us because we're different, I think it'll be important to continue normalizing LGBTQIA+ things. I think the major backlash happening now is because it's being more normalized, these people are so set in their ways and are so terrified of change that they're letting their hatred control them. It's the whole boomer mentality of "this thing is different from when I grew up, therefore I hate it."/"I'm too old and therefore refuse to learn/change" (and yes I realize not all bigots are boomers, but you don't have to be a boomer to act like one)