Why aren't teenaged girl allowed to have literally any interests with being criticized?

In making my way around my usual hellsites everyday and talking to people irl I've noticed that teenaged girls interests are always considered like somehow stupid or less than for no other reason than girls seem to like them. Like there's SO MUCH of this on reddit and TikTok especially with the popularity of that horrible Boys vs. Girls meme. From like the Backstreet Boys to Twilight to Billy Eilish literally the only strike against these for most people is "Well its just for teenaged girls" and like so??? I had a lot of friends that were teenaged girls and they we're all (mostly) awesome people so like what's the problem??? not to mention the whole saying-that-one-interest-is-only-for-girls thing is super weird. like ok we're assigning made up genders to irrelevant interests. Like my step-dad who said "well jeeps are girls cars" its a car???? sir????? and even if they were so????? they're still cool??? society is so frustrating god