Hold the front page, groups of uniform gender-race people have acted cordially to people who aren't the same gender race for thousands of years? Citation needed.

I believe what he's saying is that without the action of individuals within certain groups, it would be impossible for those in groups without power to progress. If they were uniformly racist and sexist, then progress could not have been made.

That's to say they are capable of it, not that it's ideal or that they were responsible solely for progress. Most abolitionists were not African-American.

> Can groups of uniform gender-race people no longer act cordially to people who aren't same gender-race?

"No longer?" At what point did they ever?