For one, blocking users in a geographic region would not be legally considered racial discrimination unless you can prove intent. This is the bullshit loop hole that makes it easy to get away with discrimination, but that's the way it works.
If Google really wants to play this game and create a technical gate preventing usage of sites by anyone that uses a browser that may be blocking ads, there's a legitimate business need there and all they have to say is they are no longer willing to serve users that refuse to pay by viewing ads and providing valuable data. In the case of Chrome they can extend this and say they are helping make sure anyone hosting content online can also protect their revenue as well.
Is that a shitty practice and will it cripple the internet as it was originally designed? Absolutely. But likening this to systemic racism is an insane argument and really doesn't help get at the underlying problem that we would all rather have an internet that is open, free, and not designed entirely as a corporate ad playground.
