AITA For saying money troubles?

I personally find this whole situation ridiculous. I work as a grocery store cashier and some girl comes in with her friend to buy a few items. They tried to use Apple Pay. Idk if it was the app or a glitch on our end but it wouldn’t go through for some reason. The friend then tried to use her debit card but it kept not reading it. I jokingly asked if they were having money troubles. I didn’t mean anything by it; I was just trying to break the tension. The friend goes on this long rant about how she “ain’t never had no money troubles in her entire life!” Their card finally goes through and the main girl tells me that I have mouth troubles. I ask her what she means and she screams at me that I shouldn’t imply that the customers are poor. I tell her to lighten up and that it was just a joke. She tells me I shouldn’t joke about things like that before storming off with her friend. AITA?