Great advice all around. It is an important skill to have, being able to see the toxicity of a person, and I think you really did a great job of calling out the key trait:

“A Toxic Person Can’t De-Center Themself” I think this is, in my experience, the easiest way to see the toxicity of a person. The conversations seem to always lean back in their direction, any issue you are discussing somehow leads to them discussing their issues.

Good advice, thanks for sharing.