I can't imagine forgetting that phrase from school over 2 decades ago. I get people not knowing lots of the details, but missing that, work will set you free.. etc etc. That's really bad.

Im a process chemist and we often actually form solutions at the end of a chemical process that are unfortunately deemed "final solutions". There's not really a way around it since it's the most technically accurate way to describe what we're dealing with

Edit: and I always find it uncomfortable to say

Come on now. It was reasonable for someone to say the final solution in your scenario. It is totally reasonable to call out these things especially when it is purposefully being used like the OP. However, your scenario sounds like you are making a situation about something it isn't at all.

I feel really uncomfortable when a black service worker calls me "boss".

Idk why...I think there was a book that we listened to in like 7th grade that was narrated by LeVar Burton where there was a character that was, I think, a freed slave, and he was travelling with some young abolitionist white kid, and he'd always call the kid Boss, and it made the kid like really uncomfortable, and that must've rubbed off on me.

I was in a meeting planning a large corporate event. A chef was there discussing food options and how they were having trouble finding a kosher meal provider but they have a work around until they find a final solution. Me and one other person both looked up and made eye contact, but no one else reacted. I had to pull the chef aside and ask him not to use that phrase when speaking about kosher meals.