Ancestry is a much more specific trait than race. To have pride in one's ancestry is to have pride in one's on familial history and heritage.

To have pride in one's race is to hold said race above others, which strips people of their individuality and replaces it with a collectivist view. This collectivism inevitably leads to oppression, no matter what "side" you are on.

It's Okay to be White, because being white is neither good nor bad.