I find perspectives like yours interesting because I experienced something similar when I was a closeted bisexual, and working through internalised homophobia was necessary for me. However, I have gay friends who are icked out by heterosexual PDA, and so I don’t feel comfortable assuming that what you’re experiencing is homophobia without applying a similar lens to what my friends feel (which feels wrong, because as a bisexual, I find both The Gays and The Straights deeply confusing)