individual racism where you have general prejudices against another ethnic group/race and
Institutional racism, the one Greasy is melting down about where a society's institutions favor one race over another.
White people can be a Victim of the former but not the latter. The two are often conflated which causes all the confusion about the topic and why race issues are so difficult to discuss and deal with.
Ya. Whenever you take elements of a culture outside your own, that's appropriation.
If someone is making a mockery or tons of money exploiting said culture, than that leaves just appropriation into exploitation categories. Classic Recent Example: Miley Cyrus.
Another offensive one: Gwen Stefani.
These are the most boldfaced ones in pop that I remember.