What are you talking about?

I didn't say that being willfully ignorant is an excuse for doing the wrong thing, or even just being young and stupid. 

I'm calling you on carelessly deploying an insult like "mental case" to discredit racists.  First because racism is wrong regardless of the health of those who adhere to it.  But mainly because people with mental illness have enough to deal with without adding that to their big pile of stigma.