Read some of his latest blog posts. Like https://world.hey.com/dhh/wolves-sheep-and-gypsies-ba44af6a

I'd say he crossed the line when he openly supported ethnic cleansing via remigration. I.e. deporting legal citizens that aren't the right race. If you don't think that's racist I don't know what it would take...

Before that I'd have said he was on the edge, but now it's pretty clear cut.