I guess you missed every time they called Tim Scott and Judge Thomas uncle toms.
Some on the hard left put a large focus on controlling the use of language. They are the arbiters of what is offensive, etc. Those "guides to inclusive language" that made the rounds a few years ago were perfect examples. You can't say blacklist or totem pole or "no can do". You can't say kowtow or gyp or "master branch". What is insisting you control the language of others except acting as it you are morally superior to them? Generally speaking, wokeness/political correctness is exactly that: acting as if you are better than others and your moral pronouncements (no pun intended) should take precedence over theirs, because of your superior moral authority.
However, I have to say it again, being called a boot-liker and a tech-bro does not bear the weight of a couple of centuries of slavery behind it. Maybe "nazi" would have a similarly charged undertone, but again, if someone tells me that I'm a nazi, I check my behaviour for what might have made them say that and then just stop being a nazi. It's not subtle being a nazi, or a fascist, or a sexist or a bigot.
Racist slurs can not be corrected for, you can not sit down reflect on your life and stop being Black, Hispanic, Asian or Middle-Eastern. But you can if you're a nazi.