Is finishing the RNC on the chin a dick move?

I have been training at a new gym for the last few months. I was rolling with a purple belt and took his back with a body triangle. Went for the RNC and he tucked his chin, but I kept squeezing. I eventually let up and moved to mount before the buzzer went off. After the roll, He got all pissed off and told me “we don’t do that here. We don’t try and hurt each other. I know you’re new here but don’t be doing that here.” We went at it for probably 10 minutes before I said fuck it and left

I basically told him that anything below the eyes is the neck, and if it hurt, he should have tapped. Tucking your chin is not a defense. It should be used as a small piece of your escape.

Am I the asshole or is he sensitive?

(I’m a purple belt)