Personally I knew plenty of boys that were not fuckups. I know also boys who are fuckups or went through periods where they as kids were troubles, but I know also plenty of perfectly fine boys.
Of course each of us has to deal with a plethora of cultural influences and pressures, but in this case you're just asserting things and maybe gaslighting a little. Someone shared an anecdote that counteracts your assertion and you go and post hoc fit your conclusion by claiming there are in fact other secret stereotypes that must be there as well. Maybe they aren't there.
>Personally I knew plenty of boys that were not fuckups.
So do I.
In my case, however, all the fuckups I know are boys. All of them. I don't know what that anecdote says, but it says something.
Me posting first time: these stereotypes coexist.
You: You are opposing him and gasslighting. Also, he contradicted you.
Me now: wtf. Also, he could not contradict my assertion, because I joined only after him and made no assertion before.
Things just aren't that simple, and there is tendency of only highlighting these 'microaggressions' suffered by young girls. I don't dismiss that it happens, but growing up sucks for everybody and these indignities are suffered by everyone. And it doesn't end with school, when I started working I went out to some trade-shows as a technical resources with a young (under-30) sales guy. We got no respect from the 50+ year old gray beards in our industry. As in, we, and especially him, got overtly disrespected because of our inexperience and youth. And when you're young, you always feel like you're behind (because you are), and you're desperately trying to push forward and gain recognition, respect and acceptance and you really feel the small daily indignities, from the meeting you weren't invited to, to project you aren't on, to your ideas being ignored (not even dismissed, just ignored), to simply not getting the credibility or respect or recognition you feel you deserve.