okaythen

This is it, what those statements are implicitly saying is you can't be black and work in tech. They place an extra barrier in a already difficult situation.(job interviews)

Can you explain how racism isn't a personal choice?

Sorry that's ridiculous, if your in group affiliation excludes others its a huge problem with your group. Equating it to a language is also awful being exclusive on the grounds of sexuality, race and gender is a deliberate choice that people make. If your culture is lacking in diversity seek it out you'll never know what problems you can solve by adding to your view point.