Without being a therapy session, and please no unprofessional answers, how do employees stay employed in hard jobs?

I'm talking the Michael Scott's of the world, that's me. I'm happy, upbeat, and want to do the best for the customer or client - yet when they come with a bad attitude, you better believe I absorb it despite wanting to put up a screen to deflect or a shield to block all their negativity and criticism and frustrations. Customer is always right, or the company is, not the employee. Who's replaceable it seems, the employee (broad speakings here). How is that fair?
Working life isn't fair
Michael Scott is a dream boss and a model citizen (why can't everyone be like him)
Why can't everyone be like Michael Scott in the world's population of 8 billion plus?
Results
Because I'm uptight, whether as customer, client, or as your boss/share holder or coworker
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Without being a therapy session, and please no unprofessional answers, how do employees stay employed in hard jobs?
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