how to tell a person in a nice way that she/he is insolent?

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There is this person who went overboard but i don't know how to deal with it. that person is my driving instructor. While i was driving, he asked me if i go to school and in what i am studying. So I told him that i was an actuary and explained to him that it's like mathematicien for insurance company. When I was parking, he told me to turn the steering wheel for one and a half turn. i was puzzled and didn't understand why he wanted to me do that so I was unsure of what i was doing. Then he said: 'you are scaring me...I asked you to turn for 1 turn and a half. you are a mathematicien and you can't do this?' allright...i must admit that i was silly for not understanding what he meant. i guess my brain wasn't spontaneous at the moment. But was it necesary for him to say that? i didn't shout back at him or anything. i just ignored him and he said: 'You are really scaring me...you mathematiciens use many complicated equations but you can't understand when i tell you to turn the steerwheel for 1 and half turn. Would you understand if i tell you if i order to make two steps forward?' It was very insulting and rude. I can change to a different teacher but i don'T want too because i want to meet him again and tell him to his face how i didn't appreciate that. My mom though that he was wrong and it was unecessary for him to say that. But maybe that he was in a bad mood so he was throwing everything at me. She sugested me to tell him off in a nice way. My boyfriend said to just ignore him and finish up the courses. i am not going to see him after i finish these drving class so it doesn't matter. But i just feel that i can't get over it if i don't tell him.