This has happened to me as long as I have been taking photos. One instance in particular sticks out:
Visiting Costa Rica in 2003, I shot over 80 rolls of film. Later when I had uploaded a few of the best shots, people began commenting, repeatedly using the line “These photos are great, you must have a really good camera.” At the time, this kind of insult was rather new to me, so by the fiftieth time, I began replying “Yeah, my camera is so good that I didn’t even go on the trip, I just sent the camera to Costa Rica and it came back with all these amazing shots!” Nowadays when the same comment is made, I just smile politely and say “Yes, it is a great camera.”
Photographers, check out this blog. It is often funny, but more often depressing: YouAreNotaPhotog.