I shop with my DDs. I was a size 14-16 (I lost five stone last year, first time I've been overweight at 47).
I carry the clothes that they are going to try on, they're aged 18-30, size 8-12 and from other Women, I've had numerous remarks along the lines of 'size of her and she thinks she can wear that'.
These aren't teen girls making these remarks.
My DDs have really naturally thin friends, they don't get the abuse that the larger young Women get.
Sit on a bus, with teen/young men on it and listen to them critiquing and insulting the Women that they pass.
The worse part about doing a BA as a Mature Student was the constant Sexist/Body Shaming (of anyone over a size 12) from the younger Students. There were a few 25+ Women, who also did that.
How many FB memes are there that take the piss out of waking up with a thin woman?
Body Shaming is constant.
I don't like the posts on MN that say things like "a size 10, isn't that slim", it depends on your frame etc and it doesn't depend on height.
There's a celebration of, not taking exercise, drinking excess alcohol and processed food, generally, on here.