I'll bite, and touch the subject with a 10ft anonymous internet pole.
Are black people more emotional than white people? I don't know. What I do know, is there are is both empirical scientific research and genetic differences between races and genders. I wish we could strike a balance about it without being considered either racist or anal-retentive in political correctness. Do some people use that as an excuse to be racist or sexist? Yes. Do some people deny facts because of political correctness? Yes.
Some groups statistically are more prone to certain diseases, are more intelligent, are more athletic, etc, etc. This is even after you control for variables such as education, nutrition, etc. But in all categories, there is a lot of overlap. Enough overlap that stereotyping among races/genders is not justified (usually the difference is just a few percentage points). But it doesn't mean that from a statistical standpoint those differences are non-existant. And it doesn't mean anyone should be denied equal rights, or anyone should be denied the opportunity to live up to their potential.
Personally, I think one of the reasons the US is one of the greatest nations in history is because we have been a melting pot for all races, cultures, and genders.