Am I really this dumb?

OK so last night I was out with my friend Mariah. We went and met up with some friends of her at work and had drinks. One of the guys is deaf. We were having cocktails and chatting when he asked me if I knew sign language. I said no...but look and started digging through my wallet. In my wallet I found a token that has dream written in Braille. I took it out and showed him. Instantly I felt like the biggest idiot. He looked at me and said, " I am deaf not blind" then looked at my friend and said...." I am deaf and she is dumb"

OH MY GOODNESS! Cannot believe I did that.