Should people be able to choose their race like they can choose their gender?

maybe but i dont care what race i am , i'll take whatever i get

No, but the people of the race involved should be able to make honorary members. Like in the 80s I was made an honorary African American by the brothers in MacArthur Park!

People are already doing that in a plastic way.  

There are only 4 races: Black, White, Red, Yellow.

Most people are of mixed races. If you live in America, there is a good chance you are at least 3 of the races.

I think you are free to choose, unless we start checking everybody's DNA.

Uh, no.