It is one thing to freeze up when a spider comes near you. Yes, that is definitely phobia.
But you not wanting fish isn't classified as a phobia, even though you have a clear aversion to it, because you're not saying all seafood is bad, or that people who eat seafood are in some way wrong, or less of a human being, or committing a sin.
For a person to say "homsexual intercourse isn't for me" wouldn't be homophobia. That's their sexuality. But to judge others who are homosexual is different. When aversion to the innate nature of a person, or a group of people, is used to demean them, I think that very much counts as a phobia.