i think this is a great discussion topic, thank you for bringing it up! i should preface this also by saying that my perspective comes from that of a sex averse/repulsed asexual- so in both real life and tv/books/fiction, i get uncomfortable by sexual topics generally speaking. this does extend to some forms of PDA for couples of all orientation as well, though i should clarify that i have no issue with what consenting adults do in their homes, as that is not my business.

others have already pointed out that the exact phrase you included tends to unfairly target queer people, so i will touch on it as though it were being equally applied to straight and queer people. if others being sexual in public makes you uncomfortable, there is nothing wrong with staying in that mindset in my opinion, especially if it is your comfort zone as is. while moving out of it could be personally beneficial if possible (not being uncomfortable is more pleasant than being uncomfortable), it’s not morally wrong to be uncomfortable. don’t let anyone make you believe otherwise.

while passing judgement on others for being sexual in public is a separate topic, and one many here would say is immoral, idk how to feel. i really try not to judge others for PDA, but if it’s like, really intense… i think it’d be lying to say i don’t judge others at all for it. but i don’t think that’s objectively morally wrong or something, i just have my own quiet opinions and keep them to myself. that’s okay too.