This might be a learned defence mechanism against a general feeling of wearines with the state of the world. You might work a (relatively) well-paying job at a megacorp, but often you're confronted with colleagues that get promotions through what seems like bullshit projects, you see how useless your directors or even execs seem to be and how much cash they pocket, and you're forced to do some sham work yourself, maybe because whoever is leading your team wants to advance their career. So your everyday work experience is crap, and you have no agency over anything, and you feel miserable.

Then you see the cleaning staff, and you're confronted with their reality, the fact that they have to do work that is both harder and potentially more useful than what you're doing but they don't get any of the benefits, and they get paid a fraction of what you do, and that just makes you feel even worse, like this entire system is somehow fundamentally broken, which makes you want to trow your ergonomic chair out of the unopenable glass window of your open space.

So it's easier to just look away.