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The problem is proof. Because sexism is often overt, it is easy to find language proofs of sexism. Racism is more covert. Reaching for nonsense like Senator Clinton saying she admired what LBJ did for the Civil Rights Act does not constitute proof of anything. Clinton did not use a single word that insulted MLK.
When you have some example of someone calling a black person a nigger here -- the way that people at Salon have called women cunts -- then you will have a case of overt racism.
I have never said sexism is worse than racism. Not once. However, I have said that the issue of sexism is one of my particular priorities -- along with the disenfranchisement of older people and the working class and the disabled by the caucus system, and children's rights, and the sexual victimization of people in matters of rape, the sexual abuse of children, and the treatment and mistreatment of the disabled, especially those with mental illness.
BTW, patronizing people with a mental illness is displaying a prejudice.