I ve been having the same problem, I need to stand up for myself, all I have learnt is to be quiet, and ignore it, it's not working... for me personally

What kind of situations were you in, so we can get a better idea how to help?
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there will always be rude people, I try to accept that they do not know how to present themselves in a certain manner. They have problems they need to deal with, they weren't raised to be polite, they lost their friends, their car got keyed, just got a traffic ticket, they didn't get any birthday presents, they have a disease, they have severe constipation