Why do men get so upset when women have inevitably seen more penises then they’ve seen vaginas?

People always bring it up like it’s some kind of ick or insult, and I genuinely don’t understand why they’re so upset abt it. I’ve seen ~10 penises and one vagina (my own obvi). If my partner has seen more vaginas then I’ve seen penises, that’s not a problem, nor should it be, right? I honestly don’t understand why men get so mad about this. If you have a problem w/ that then you have been your own sex.. why would you ever get mad at someone else for doing the same??