I never use their words for things, and I notice they always repeat my order in their language. One of them tried to prompt me to use the right language, and I told him, “you work here, you have to call it that. I don’t. I get to call it anything I want.”
He laughed. He didn’t call the cops, which apparently was lucky for me.
Eight out of ten times we'd hear the customer hang up around the word "future".
My conclusion at the time: business people are stupid.
My conclusion 25 years later: business people are stupider than I could have possibly imagined.