Maybe they should say that, because the concept of "unrealistic standards" as a bad thing is stupid.
It's just unhappy people projecting their own sense of inadequacy onto fictional characters. But making fictional characters uglier, weaker and less confident won't help anybody. Nobody's life is going to be improved by seeing Superman portrayed as some skinny nerd with pizza acne or Catwoman as some morbidly fat bitch zipping around Walmart with a big bag of kitty litter on her reinforced mobility scooter.
Unrealistic standards are good. It's normal to want the hero to be a ruggedly masculine devil-may-care badass who fights dragons or orcs or whatever. It's normal to want heroines to be slim, beautiful and pure-hearted women with big tits. Not every story needs to be like this, but the basic formula has been popular since the invention of writing.
Why?
Because normal humans want entertaining escapism and we want our heroic archetypes to model the best of us. The Anglo-Saxons didn't write Beowulf as a kind of dark ages superhero because they were trying to discourage young men. They were trying to encourage them to heroism.
The Vikings didn't make Freya the goddess of beauty in order to oppress withered crones with no teeth. They were modeling what idealized fertility looks like.
Boldness is good for young men, and beauty is good for young women, because we're a tribe of mammals who arrive naked and helpless into this indifferent world and survive and create the future by fighting and fucking.
If feminists are unhappy about that, well... whose fault is that? I've never known a happy feminist, so either the global patriarchy is doing an amazing job of sabotaging the emotional health of some of the most privileged human beings who have ever lived, or they're just losers.