Some of us have walked in the others' shoes, at least in this limited case of discrimination based solely on clothing. Guess what? Humans discriminate on clothing! You can drum up the social justice network and try to remove this neural programming without drugs, good luck with that. You can try and fight it, again, sincerely, good luck, I agree that clothing is irrelevant when judging other people, but I don't think you'll succeed.
However, unlike discrimination based on someone's skin color or gender, discrimination of clothing has a very easy solution for the person being discriminated against: change your outfit. Some people who love their t-shirt and jeans need to wear a suit every now and again if they want to be treated well or taken seriously by certain people (and vice versa depending on social context--some formal suit-loving people need to dress more casually if they go to certain conventions for a talk). If I were a muslim girl getting discriminated against for wearing a hijab, I'd stop wearing the hijab.
However, unlike discrimination based on someone's skin color or gender, discrimination of clothing has a very easy solution for the person being discriminated against: change your outfit. Some people who love their t-shirt and jeans need to wear a suit every now and again if they want to be treated well or taken seriously by certain people (and vice versa depending on social context--some formal suit-loving people need to dress more casually if they go to certain conventions for a talk). If I were a muslim girl getting discriminated against for wearing a hijab, I'd stop wearing the hijab.