This is something I've struggled with, and it's hard get over being slighted or having someone disrespect you. It helped me to start by working on my self-image and esteem. It's a lot harder to let others get you down when you're "gung-ho" about yourself (in a good way, not megalomania
)
Steve writes a lot about these issues, but I'm new and not familiar enough with the articles to pull links. (I'm v. sorry-- Perhaps some of the site veteran's can help us?) He also addresses them in parts of his podcasts, which are a nice place to start if you haven't heard any. I was most skeptical regarding the one about "subjective reality," yet that podcast turned out to be truly enlightening and helped me distance myself from other people's opinions.
Good luck on your journey!