I think it is a very good exercise to think about the "racist" things that one thinks or does. Only by recognizing your actions can you start to think about them critically.

The "appropriating" culture thing is one I still struggle with, specifically in regards to housing. I would rather live in a diverse neighborhood. However, in all the reading about gentrification, even just one or two white people moving into the neighborhood can start the shift, within 2-3 years, to an all white or majority white neighborhood.