[rachofsunshine]

Being polite often IS emotional work, even for neurotypical people operating within normal environments. The nature of customer service is that you are dealing with the general public and expected to not tell them "sir, you're a raving lunatic" with any particular regularity (despite the fact that a pretty substantial portion of the population are in fact raving lunatics).

Even non-service jobs regularly involve emotional labor just to maintain good relationships with your colleagues, because some emotional labor is involved in almost any collective endeavor of human beings.