Imagine if surgeons and infectious disease specialists talked about a disease being "icky". That's what the use of "toxic" in psychology is.

"Toxic" implies a situation is emotionally poisonous like a toxin (toxin is also horribly used in alternative medicine, as in you need a detox, but they won't define what the actual poison is). Or it is perceived that way. It describes only an emotional reaction of disgust, and blurs any further details and gets in the way of solutions. We have no idea from the use of the word toxic if the poison is coming from the speaker, the other party or more likely it isn't even toxic, it's a Dave Mason situation. That is, there ain't no good guy, there ain't no bad guy, there's only you and me and we just disagree.

We are never going to be taken seriously as a science or even a quasiscience unless we do a better job of defining our terms instead of obsessing over our disgust.