The work DHH is doing with his Linux distro is amazing and has done a LOT of good for FOSS recently.
I don't agree with everything he says, but nothing on his blog is worthy of the hate he is getting.
This is a “boy who cried wolf” situation, when you call everyone a Nazi and try to cancel them for opinions that are debatable in polite society, it just opens the door for actually dangerous ideas to take hold. The modern left is unrecognizable from the left I grew up in.