Hi, one of you guys said that race is a human construction, unlike ethnicity. Actually both are social constructions, just like countries, languages , patriotism.

Unfortunately another individual said that "different races do different things better "
That is the exact definition of racism. It is also quite wrong.
http://www.merriam-webster.com/dictionary/racism

Racism

1. " a belief that race is the primary determinant of human traits and capacities and that racial differences produce an inherent superiority of a particular race "

Just sayin .

-al