Depends on what you mean by "normal," I think. It's relatively common (it’s not uncommon among women in general to have a phase or persistent belief like that), but it’s not a mindset that should be encouraged or excused. We don’t try to normalize trans men becoming misogynists immediately after transitioning for the same reason - it alienates other members of the trans community (and is just not a nice mindset to have in general).
I was friends with mostly girls pre-transition (mtf) and one time got verbally abused by their RA when she tried kicking me out of my friend’s dorm room (which is decidedly not part of their job). Body shamed tf out of me just to get me to leave. Realized I was trans the next day bc of how upset I was and the way it made me upset (dysphoria). Suffice it to say that I see those who blindly hate random men as shitty people lol. Would never do that despite my transition experiences.
Do you have any positive relationships with men irl? That’s almost certainly a large part of why you're learning that association (if you have relationships w/ other men, probably the best thing to do is minimize time with roommates and maximize time w/ your friends. Probably you should do that either way though lmao)