I've had jobs where I was called stupid to my face, repeatedly, and the expectation would be for me to enthusiastically nod, smile, and say "I can see why you'd feel that way, but..." then launch into my sales pitch for an extended warranty on a $70 printer or whatever.

By the end of each day, I was completely fucking drained, and the fact that I was sending out dozens of job applications every day for years to get out of that role was not lost on me.