I don't know why I'd form an opinion on whether he's prejudiced--I'm not particularly interested in classifying people based on arbitrary divisions, especially when they're pendantic dictionary definitions that include archaic meanings of the word. I'm more interested in discussing people's beliefs and behaviors.
Two situations have been mentioned in this thread:
1) coming across two men kissing in public, and
2) you seeing a morbidly obese person naked.
I honestly have no interest in classifying either you or the GP as prejudiced or not prejudiced for your feelings in either of these situations. What I'm more interested in is:
1) Can you regulate your emotions and behave reasonably in these situations, and
2) What underlying beliefs cause you to feel some kind of way about these situations in the first place.
To be frank, I think it's childish to be unable to regulate your emotions in these situations. Context of course matters--if someone is trying to force you to look at these things, that's not okay. But that's not what's happening in the vast majority of cases. In the vast majority of cases, if you come across men kissing in public, or a fat person naked in a locker room or bathhouse, those are just people going about their lives and if you have some negative feeling about that, that's very much your problem. It's not their problem, and it's not the problem of the legal system.
To be clear, your purely qualitative preference is 100% not anyone else's problem. I don't care what your purely qualitative preference is, but I do care that you're making it other people's problem.
People will really talk about how they value freedom and make fun of "snowflakes" for getting "triggered" and then those same people will want to restrict gay or fat people from doing the same things as straight or thin people so they can avoid getting triggered. It's childish in a literal sense, like a kid crying because they're mad that it's raining. Sure, you can not like the rain--that's valid--but at a certain maturity level we can expect that you will regulate your emotions enough to not lose your shit about situations where you can have no reasonable expectation that things will go the way you prefer.
The reason your beliefs matter is because people like me are willing to teach you how to regulate your emotions. Part of how you regulate your emotions is by questioning the beliefs that cause you to feel what you're feeling. For example, you seem very concerned about the absurd possibility that someone might expect you to (in your words) "let a man fuck [you] in the ass". I'm sure you can find some fringe weirdo who wants that, but I am very confident that nobody in this conversation is interested in coercing anyone into anal sex, or any sort of gay activity for that matter. The only thing I want from you in relation to gay people is for you to treat them with the same kindness and respect that you (ostensibly) treat anyone else with. Maybe if you were a little less irrationally terrified that a gay guy would try to have sex with you, you'd be able to regulate your emotions about gay people a bit better.
And... I'm not fat positive by the way. I think the science is pretty clear that obesity is a serious health issue. I just don't see any rational reason to leap from that to insisting that fat people are ugly and gross. Do you go out of your way to tell people with lung cancer that you're not attracted to them?