What would I have said?
"You close that fucking mouth of yours before I come over there and rip out your fucking throat with my bare hands! I should give you a fucking beating just to show you that your parents were doing it wrong your whole life! If you open your mouth or honk that horn again, I swear to all things holy that you will pick up your teeth with broken fingers tomorrow when you wake up."
Gilda, bless your heart. You are a beautiful lady with too much going for her. Let us rude, inconsiderate assholes in the world fight amongst ourselves, while you stay just the way you are.
I would not foresake convenience just because you had a bad first time experience. The most perfect person in the world says "I'll try anything twice..."
And by the way, I helped a little old lady (85, 90?) use a bank machine for her first time. It was a little cute, and she thanked me very much. That was waaay better than getting upset because she was taking too long. I'm not comparing you to a little old lady, Gilda (
); I am just drawing a parallel to illustrate what one should do in a similar situation.