I'm so used to nutty people. They are everywhere it seems. Two out of a hundred are truly psychopathic. Learn to know which ones those are, the rest aren't nearly as dangerous, by orders of magnitudes. Psychopaths only respect strength, it's good to just show some strength to them if you are setting boundaries. Most of the rest of people can be reasoned with to respect boundaries.
Learn what you won't tolerate, etc.. I can't stand people that monologue with me, if they don't allow me to talk I get very pushy with them and refuse to have anything to do with them until they learn some conversational manners. If it takes a cell call to the PD to set boundaries, so be it. You can call 911 and ask for a State Trooper if you are being bullied by a local cop actually. A friend did just that and it worked out fine eventually.