However, if you want a non-ridiculous, non-genetic explanation that explains the gap, try this one:

Respectfully, that explanation is ridiculous. If you wish to debate it with me further, please read my blog post and respond there.

However, now I see that you're worried about whether people will end up assuming someone is being racist when they're not

Some one, or some organization. Anyway, the issue you are addressing is a slightly different one from what I raised. Basically you are making the "who cares" argument. But the reality is that our society cares very much, just like many Europeans in the middle ages cared very much about devotion to Christianity. Publicly pointing out the weaknesses in the Christian position could get you into serious trouble back then, just like pointing out the truth about race and intelligence can evoke a lot of hostility in modern day Western world.