It's so disgusting how gay they are and how they identify differently than their birth gender. I should probably research them some more 3-4 more times today or until I run out of tissues...
I'm not entirely sure, but I suspect that part of it is rooted in misogyny and toxic masculinity. They objectify and disrespect the opposite sex, and they think that's normal and that people of other sexual orientations and genders must do the same.
That's why often their hate is rooted in fear that gay men will sexually harass/insult them, or trans people will deceive them, because that's what they'd do if they were us.
There was a comment that summed it up rather nicely but can't remember where it was. The gist was that conservatives view anything other than heterosexuality as deviant and associate sexuality with sexual fornication.
They don't understand or even comprehend that they aren't the same thing. So for them, simply saying the word lesbian is pornography because they can't see it as two women in a relationship like they can with heterosexual relationships.
Also, the whole "out groups" and "in groups" thing.