Chance to prove race doesn't exist.

Debunk everything in this book to prove there is no reason to believe race doesn't exist.
http://www.charlesdarwinresearch.org/Race_Evolution_Behavior.pdf

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Good response to a troll, short and to the point. However you could have pointed out that the troll is using a strawman argument and no one here has said that anti-racism is neccesarily extremism, sharing genes equals superiority or that nurture does not play a role in developping someone's abilities.