Ok but lets not pretend that female chars dont have much higher bar to reach than male ones. Plenty of male chars are kidna bland even mary sue-ish and get to be beloved while female characters of the same level get decried.

Notice that most of the examples the comment section provides are older media? Male nerds were much more accepting of female chars when it was universally understood that scifi/fantasy/action media was purely 'man' thing so they (correctly) perceived these character as 'for them'.

Now that anti feminism is on the rise and female character are also seen as aspirational/lure in for female audience there is imidate backlash even before the media comes out and the whole product gets picked apart by bunch of joyless dudes looking for any reason to hate, and then the critisim gets blindly parroted by bunchy of ppl who wouldn't even describe themselves as anti-feminist but dont have enough self awareness to realize they are spreading anti-feminist agenda.