That sounds terrible.
I have another moment that I really regret.
So, near where I live, there is an Asian steak house that me and my family go to every year on Christmas Eve. After eating there one year, I went over to the guy making sushi rolls and said to him;
Me: Excuse me sir, do you mind if I watch you make this?
Sushi Guy: Uhh, Lunch? We do not have Lunch, no no, is late.
Me: No, no, I meant can I watch you make sushi?
Sushi Guy: You...want sushi Lunch, yes?
Me: No, no, I mean,
(Guy calls over another employee in another language)
Other Employee: Sushi lunch? No sushi lunch today, it is too late.
Me: Oh, sorry, does he (sushi guy) speak English?
Other Employee: No, he does not speak English, no.
Me: Oh...sorry.
(walks away quickly)
So that was really embarassing.