This is such a dumb boomer thing to say. I have worked at multiple starbucks locations and i go to coffee shops all the time. I usually order a black house coffee. I have never been to or worked at a coffee shop baffled by black coffee. It is the easiest thing to serve. I promise baristas are relieved to hear you say black coffee as it means less work for them. They probably asked if you wanted a dairy/alternative and you got mad about that for some reason. Also, maybe don't be a dick to people working a job just trying to live their lives when it seems like you can barely rub two braincells together to effectively communicate what you want.

It's because filter coffee, espresso, ristretto, lungo, and americano are all "black coffee" with no extra ingredients and all different.

Wow if you were going for a pompous caricature, you just about nailed it. I'm surprised you didn't call other drinks "froufrou" and point out that you're a real man for drinking it black.

I'm not saying everyone who drinks their coffee plain is arrogant but boy are there a lot of you.