One of the most toxic person I worked with was the manager of an organisation I worked for. This woman is particularly selfish, often arrogant and without any respect for the persons she used to manage; more than once, I saw her humiliating her subordinate in from of other people (worst: she was often wrong concerning the reasons of its reprimands)
Despite the fact that I did not went often in this organization and efforts to regulate our relationships, I first used to avoid going there at the cost of loosing good relationships I had with all other members and at least to decided to quit. My only regret is that I did not took this decision earlier.
Jean-Francois, strange coincidence - I also have started to cross as quickly as possible the corridors when in the building of this organisation to run directly to the partly safe place of the lecture room. I don't know - it seems that people accept being oficcialy treated with such toxines. Fear?
I usually look at my feelings. 1. If I have internal discomfort or negative feelings, I use this situation as a mirror that shows me aspects of myself that I refuse to recognize. And I'm trying to figure out what's touch me so much about this person. Then I try to find these qualities in myself and work with it through acceptance. If I did everything correctly, the situation changes for the better without my participation (either it stops touching me, or the person disappears from my environment). 2. If I'm outwardly involved in a situation but it doesn't affect me deeply, I think about how I can help that person and do it. If I don't find anything, I just wish him the best in my thoughts. 3. The third option - there are a lot of such people around me, then I seriously think whether I am really in the right place now. (I apologize, if there are mistakes in the text, this is a machine translation, I hope the meaning of what I wanted to say will be clear)
It depends on the frequency and intensity of the working relationship. Working with such a person helped me to appreciate myself even more and to decide to leave and find a better job.