Talking about a "toxic person" is starting on an ontological track that is deprived of any possible way to make everyone satisfied. Instead it’s possible to think about toxic behavior. Now, maybe a behavior is so deeply enshrined in a person that abrogating it is out of reach for the social organization that is considering this person behavior as a source of nuisance. But this is not necessarily the case and maybe there are option to help the person change and become part of a more harmonious social structure.

Using a "isolate poor performers" and "excellent beings" has well known backfire consequences that history largely document.