Oh ok I thought maybe it’s helpful to recognize those personalities.

I think the way to deal with them is to remain strictly professional, focus on job tasks and maintain appropriate distance from them and not lose your cool.

We had someone written up at work once because she just couldn’t handle this difficult person (one that always complains) and lost her temper. At the end she got in trouble for losing her temper in response. I only know she was written up is because she is my friend at work, I’ve no idea if the difficult one faced same consequences

If the difficult personality is your boss all you could do is remain professional, focus on your task, keep your distance (when appropriate) and keep good documentation to cover yourself. I think. Not sure. I never really had difficult bosses but I had difficult coworkers. Distance and professional demeanor at all times is the way to go imho