I can break it down to three points.
1) Talk about what he has done and how you know it.
2) Don’t talk about what he says or other people’s opinions of him. Most of it is meant as distraction, anyway.
3) Don’t make it personal. We’ve known ad hominem arguments aren’t sound since Socrates, it’s time to stop using them.
If an article breaks any of those rules, don’t share it, give it claps, etc.
And the same system works for criticizing any human being.