Race. Is. A. Social. Construct.

No, its not. humans that have spent many thousands of years in different environments have evolved away from each other. Its not just melanin. We are genetically diverse enough for us to simply look at your DNA to determin what not only what race you are but what subgrouping of that race you are, we can trace your lineage back to the specific region of a continent your ancestors evolved in. If race was a social construct that would be impossible. If an anthropologist or archaeologist finds the skeleton of someone they can quickly determine the person's race from the bone structure, as well as which subgrouping of that race the person hails from, depending in how well the bones are preserved, if race was a social construct this would be impossible.

The idea that the percentage of people who share nothing in common with you (except their skin colour) decreasing scares you actually gave me some chuckles though.

We dont just share skin color. We share genetic and cultural heritage. for you to ignore that shared history and culture is is quite sad.

You're racist. It's easier to say that, so just say it.

That really depends on your definition of racist. I dont hate other races, I'm not afraid of other races, i dont avoid other races. I favor the success of my own race. If its racist to want your group to succeed and to be paranoid about your group declining then yes I'm a racist. But then so is everyone else.

One last thought, you really need to get to know your people better, if you feel nothing for them that is, because its a very ignorant thing to say the only thing you share is skin color. Thowing away your own heritage is part of the problem, not part of the solution.