In a professional setting, you can fall back on the rules of the workplace. My boss might be angry, but I don't need to read that he's angry. I just need to keep doing my job. Or I get fired. I'll survive either way (losing a job and finding a new one is part of the game.)

I don't need to care about the emotional states of the people I work with. There's base-lines of professional conduct and courtesy. If I reasonably follow those, then I'm good.

And what if your boss is just an asshole? What if the reading you take of the person on the other line isn't just a misunderstanding? This person really is being a jerk, then what? You be a professional. You don't have to take excessive abuse, you can quit. You can warn the customer that you will end the call (and you can carry through with the threat.) Being a jerk isn't necessarily abuse though.

Don't take things personally. Do your job. Work the process. Quit if things aren't working for you. This requires an orienting yourself to an environment which works differently from your home. It requires managing your emotions so that you aren't taking an existential threat level analysis with every non face to face conversation.

It's a different situation if I'm talking to my wife or children. Those are personal relationships.