Why do so many men seem to hate vaginas?

At university today (biomedical sciences) it was about hormone levels and their effects on the body through different ages. We only have 6 guys, but 4 of them kept giggling and "joking" whenever it was about the effect on women (fertility, menopause,...). Their behaviour was a mixture of "why would we care about this" and "omg they're talking about old womens' vaginas hihihi". They are 20-23... I didn't hear any of my female classmates laugh about old mens' erectile dysfunction.

I noticed this at my job as well (hospital) where male staff (nurses, assistants,... age >28) behave weirdly when they see medical devices that have anything to do with female body parts... "great I have the c**t department".. sir you are helping during gynecologic operations. AS IS YOUR JOB. Or they start giggling because they heard a gynecologist say that small specula are more comfortable for older ladies (our female supervisor told them off for this big time in front of everyone btw).

It's so weird to me that those straight men talk so bad about it while also boasting about how many women they had sex with - which involves a vagina-. Why put your dick in something you find disgusting?