Some years ago I (do not know why) I took a course named: Research-creative-in-art-technology. The teacher was graduated in fine arts, and had good skills in painting, drawing and art history, but knew nothing of photography or video (art technology?).
She is a fan of Duchamp, which I hate, and in a lesson I said that in my opinion: "Conceptual art is the refuge of the incompetent". She did not like what I said, but survived.
I learned about art history and joked acrylic painting and drawing. At the end of the course, I was photographing the work of colleagues in the exhibition, and the teacher asked my camera (Canon SLR + color negative film + Sigma 24-70mm). Then she asked me: "Where is the zoom?" I looked at her amazed and showed the rubber ring on the lens.
Some years later, my art teacher was arrested for murdering his sister stabbed in the back. I was playing with fire and did not know. Today I say: "Conceptual art is the refuge of the incompetent and crazy".
Now that's a good story. You're a lucky man surviving. Guess her sister repeated what you said about conceptual art and that was too much for her ...