Please just keep in mind that these exclusionary behaviors, in addition to the principles mentioned, create no end of trouble simply by their very existence with regards to the identity and belonging of mixed-race individuals.
That is fair, and I'm sorry you have to put up with that. It is often the same in my country for mixed race people, our implementation of affirmative action is far from ideal to say the least.
I think we may have started from different sets of assumptions and argued past each other a bit. I'm sorry for that.