/fa/ - Fashion

>went shopping yesterday
>a chubby sales assistant keeps eating french fries while "helping" me to get a suiting gown
>I ask her if I can try one of them on
>"It's probably too big for you"
>"it's XS"
>"it still can be too big, well, it's a store for adults, not for girls and adult women have curves, don't worry, you'll gain some weight soon"
>it turns out that the dress fits me well on my waist
>"oh, you have to eat more! and if you wear that dress, you'll have to stuff your bra"
>"but I'm on diet"
>"what diet?? you're sinning girl, you're crazy!"
>she keeps eating fries

Why are they like this?