I accidentally insulted a tour guide/translator at the United Nations in Geneva
How did this even happen?
I was just being extra careful at that time, I'm open to the improvement of learning the sign language for better communication.
It is good to apologize if you insult someone accidentally. In the future you should think before you speak to people and try to be neutral.
Well, I am deaf, I should be the one that people be careful around and they should know they are not allowed to speak bad of me.
It might be difficult for them to find an ASL interpreter in a foreign country. Hopefully they will accept your apology and you can get on with the tour.