About the complains..

[Matsume]

If you thank all of these random people, you're a tool

If I was mopping the damn floor and some random person thanked me... It would feel condescending... I'd be offended and want to punch you

You: "Thank you for cleaning the shit off of this toilet, you provide a valuable service"
Me as a janitor: "Thank you for shutting the hell up"

when did the world become so pretentious and douchey?

Quite possibly the dumbest thing I have read is this thread.

I thank my janitor and even say "goodnight" before leaving. I once turned off a sink that another student intentiionally left running to overflow so that the janitor would have less of a mess to clean up. I push in other student's chairs and pick up trash so that janitor lady has less work to do at the end of the day.

You on the other hand, probably shit and piss all over the toilet seat and floor and tell yourself that you don't have to be careful because the janitor gets paid to clean up your mess. This is everything that's wrong with our world. Please go away forever. Come back when you understand what empathy is.