Yeah. I see what you mean. Though in terms of African American issues -- using the word crippled versus disabled it's more akin to calling someone nigger than calling them black or African American. Some people suggest that if you are part of the minority reclaiming a word like cripple, nigger or fag give people who are not part of the minority to use it.
Part of the issue is the educational system. No matter one's prejudice, most kids know who MLK is by 3rd grade, and college is loaded with information on feminism and gender studies (or many are). But disability studies is not taught anywhere.