TBH I'm way less polite than I used to be. I literally never use "sorry" except "I want to apologize for something wrong I've done and it's a big deal". When I bump into someone I usually just move on without acknowledging the situation. But I also butt in with help without a word - there's a surprising number of children I saved by randomly approaching the parent and offering band-aids without uttering a word.

I think I kind of accepted that I don't have hardware acceleration for pleasantries and I only use them when there's something very clear I can gain from that, like at work. Otherwise I default to "Pass me the salt." like saying a command to a subordinate. "Can you pass me the salt?" is peak politeness for me.

BTW there's a fun story. Back at the university I had some shit course with another faculty, and one of exercises was spotting things on a recording. I mentioned a scene where women in a third-world country were receiving education and said "... because those chicks were getting educated" and one girl got upset "WHAT DID YOU SAY?!" while the other one got sad "nobody has ever called ME a chick!". Of course the interaction wasn't in English so that wasn't the exact word I used, but yeah.