In my opinion, people seem to think someone is toxic whenever the person doesn't support them in their views, or makes them feel bad in any way, shape or form

This is kind of amusing (in the sad ironic way) when the person who thinks other people are toxic for aforementioned reasons is the kind of person who subscribes to the kind of "positivity" that involves determinedly ignoring/dismissing "negative" situations/feelings instead of accepting/acknowledging them and finding "positive"/"productive" ways to deal with them.

They are occasionally interesting to observe though (from a very long way away).