fashion “rules”

i hate how some things are considered not for fat people. like why is someone telling me i can’t wear stripes, or that crop tops are not my thing. i ignore it for the most part but why is someone else telling me these things. in their eyes they are “trying to help me” and i understand some clothes may look more flattering, but there’s nothing wrong with jeans and a crop top. nothings ugly about a striped t shirt. are they just trying to say im ugly and can’t pull these clothes off?