This isn't even new. Women and girls have been starving themselves for a lot longer than guys have been hitting themselves with hammers.

False premise. There are plenty of examples of vice versa. It's class prejudice. A super hot prostitute is treated much worse than an ugly oligarch. This is because of trickle down mechanics, the oligarchs treat everyone and the world like shit, establishing a heirarchy based on who you get to treat like shit to establish you place in it.

I’ve just asked my aunt, who lives next door, she isn’t exactly a picture with her crooked teeth, hump and hairy legs. Auntie, I said, here’s this junior with this intriguing question on lemmy, can you answer it oh wise one? As a reply, she threw her half empty beer bottle at my head.

The wealthy surround themselves with beautiful people, get blood transfusions from young people, get cosmetic surgery. In our stories, good characters are usually portrayed as beautiful or handsome and often young. Successful characters, whether good or evil, are often beautiful or handsome. Regular-looking folks more often appear as side characters or comedic characters instead.

this view is encouraged by the fashion, skincare and cosmetics industries (not that there's anything wrong with fashion, skincare, or cosmetics per se).

So we are all being conditioned to worship or favor beauty and youth.