Actually if the folks who refuse to discuss this issue with anybody of a certain race who disagree with them have all left, maybe a conversation can finally take place.
Can anybody think of any examples of cultural appropriation in which you feel members of not-that-culture shouldn't participate?
Clearly, you can be a jerk about anything--and I think CA boils down to trying to be open and aware to ideas and offenses, but with no ethical imperative to cease or avoid an action based on it meeting the definition for CA.