Tell him to get farkt.
It’s called English, not United Statesian. Their derivative version is not only inferior, it’s incorrect.
Discussion
I agree, of course 😂
But it's not a hill I'm willing to die on if it means missing out on sales.
Right, definitely never prioritize the customer experience when selling a service. That would be disastrous.
it's American English...and it's better.
Is that like African American?
No that's made-up ethnic group. You're probably thinking (if you're thinking...are you?) of African American Vernacular English, which is a steaming pile of shit.
No, I’m thinking of arbitrary qualifiers prefixed to actual words.
Americans speak English - not their own special brand, it is no less intelligible to other English speakers than Scots or Irish or Australians or any other native speakers and doesn’t warrant it’s own classification because some puritans decided to make cosmetic changes to it 200 years ago.