Yikes, sorry to hear that. Most of the comics I'm friends with would never pick on you if you were at their shows. It's certainly not a crime to not laugh. My own teacher has been in comedy for 10 years and whenever myself or her other students tells a joke she thinks is funny she says, "Oh, that's funny."

She doesn't laugh out right, because she's analyzing our set and trying to help us make it better. I learn never to take it personally when people don't laugh. I just get through my set and go over it later on to see what didn't work.