A few things. Pike, from my understanding, is not dogma. That is to say, he didn't speak or write with a special authority for the whole of masonry (if I recall correctly, there is a form of disclaimer at the beginning of M&D, where it essentially says the same thing). He was a Mason and a philosopher, whom many find to be helpful and instructive. Additionally, when discussing past figures, to what standards are you holding their actions? Contemporary for them or for us? To put it another way, a person can admire a figure in part or in whole. I am unfamiliar with the specific quote, so others more knowledgable on the subject than I may address it, but be wary of casting absolute value judgements on those in the past. To my limited and uninitiated knowledge, there is no racial aspect to a regular Mason's oath.