Wow... There is a lot of hostility floating around towards gunsmiths.
I would have asked him "How much extra for the lesson, dipstick"?
That's not likely to get a constructive response.
Maybe he was just busy that day and didn't feel like answering. Maybe it was something simple and he didn't feel like explaining for any number of reasons.
Long story short, you took him a malfunctioning gun and got it back in working order. You paid the tab and took your handgun home.
If you don't like the man's demeanor, don't go back. I don't know about where you are, but finding a truly competent gunsmith around here is a real challenge. There aren't any full-line smiths operating full-time in central Kentucky that I know of.
If I could find a good smith around here, I'd have a new friend and give him a lot of business. Even if he was a grouch, I'd most likely smile, listen, and go on being a customer.
In a gunsmith (or any other professional whose services I use) I'm looking for knowledge and competence. All other considerations are secondary, including personality.
I could put up with the devil himself for an hour or two to get my gun fixed without having to go through the bother of boxing it up and shipping it miles away to strangers.
KR