With the difference being that you don't go around bullying people who do eat mayo, and you don't try to ban people from eating mayo.

Or well, actually, maybe you do, I wouldn't know.

I agree, but I think it's more than just not liking something. There's an active component to it, like if through your hatred of mayo you were trying to ban its use on sandwiches and in sauces.

conservatives on average have a higher disgust response and think themselves more exceptional than others.

I would say they do this more than non-conservatives because they are motivated by disgust rather than ideals or empathy.