The answer you probably want is "they're getting paid for it".

Well, no. I happened to pick a bus driver and cashier as my examples, but I could just as easily have picked my next door neighbor. I don't dislike him, but I couldn't care less about his goals or interests or personality.

Furthermore, as I said elsewhere, wanton disregard for the autonomy of such people is still frowned upon in the extreme cases. Noone likes the boss who treats employees like cogs, or the demanding customer who pushes around customer service staff because they know they can.

Treating people in a certain way goes beyond mere objectification as Alicorn has defined it: "Thinking of a person in a way that doesn't include respect for his goals, interests, or personhood."

I'm still trying to obtain a coherent definition of "objectification" that is both morally reprehensible and independent from any harmful action, such as deceiving a woman to get her into bed or treating one's employees like cogs.