I can really identify with this post. Fortunately, I haven't had any really toxic critiques. I have had negative ones but those were usually somewhat constructive.

The Shrink in my critique group does not provide very constructive, helpful critiques. I know this well enough to pretty much disregard his comments.

We once had a woman in our group who was tactless. After one of us read, she'd comment "I don't get this. I would never read something like this on my own." And then proceed to pick it apart, paragraph by paragraph. She's no longer in our group.