I learned it from school, and I only had attraction to girls back then, but it was uncomfortable for another reason. They’d spit up the guys (males, amabs) and girls ( females, afabs) to teach us sex ed separately, and some of the guys used to ask us afab people in a creepy way if we “learned anything interesting in class” after that class would let out. The fact that they specifically came over there to ask us that, along with their tone of voice, made it feel pretty predatory to me. And sometimes some of the guys would even laugh when we didn't answer. They probably enjoyed how uncomfortable we looked. I hope things have gotten better since then.