So I don't care which definition of the word you choose and technically trying to correct me on a definition is as pointless as telling someone the best colour is not blue but red. (There is no objectively "best" colour!)
I simply wanted to point out that "race" as in "colour" should not be confused with "race" as in genes in general. The OP was not clear whether it was talking about genetic differences or "racism" in the South African context, which means "colour".
I also wanted to demonstrate that some ideas or associations with eugenics are "evil", e.g. Nazism and some are not. Obviously there are genes that people may prefer. I also wanted people to acknowledge that allowing people choice in genes allows them to discriminate based on colour as well.
Most people here incorrectly believe the right not to be discriminated against is a legitimate right and don't understand the implications of that (The belief that you are allowed to restrict other peoples choices/freedoms to benefit yourself because you don't like their rationale).
Democracy is the road to Socialism. – Karl Marx
I have a different take on racism. It has nothing to do with apparent conflicts between races according to differences, or another race perceiving itself as better, than another. It is the preservation or betterment of your own race against other racial influence. Big difference.
The concept of race is very real. It's biological.
A forgotten subject, called Ethnology addressed race as biological, with all the differences etc.
Race is not a social construct. It's a biological fact.
So, in my view racism is very natural, because you are looking after your own. Nothing wrong with that. If you want to preserve your own, nothing wrong with that.
However, the word racism has been taken apart so badly, that it ignites fear and loathing, which in it's practical application is anything but.
Racism is caused by a fear of other races due to a massive inferiority complex and lack of confidence.
The more extreme the racism in the individual, the more pathetic they are.