"all racists are assholes, not all assholes are white, therefore not all whites are racist."

Sorry to be a pedant, but I teach logic, and you got the form of this wrong. Here's the correct form:

All R are A

Some A are not W

Therefore, Some R are not W.

The correct conclusion of that argument is therefore, "Not all racists are white". That claim is compatible with the claim that All Whites are racist.