Is there any objective context here? What has RMS said, what are the attacks? I assume there are also fair, clear-headed criticisms of what he has said and how he said it.
Cancel culture is about bullying and vulgar displays of power.
Now, imagine you quoted someone saying something controversial twenty years ago, and then apologized for it. And now someone starts a Twitter thread in a mass attack to find all your possible flaws as a human being. It's just sick.