Yeah, I agree. The rest of the points make a convincing argument, but the "I can't be racist, look at all my black friends" argument doesn't fly.
edited to add: The reason the "look at my black friends" argument is mocked is that in many cases the friends referred to are not friends in the true sense of the word. There's no such distinction possible when talking about a co-founder. One either is or is not a co-founder.
You can also be married and be sexist.