That's hard, when my wife and I went to class together, I was experienced(realatively speaking) and she wasn't. She shot much better than me and the other guy there. It was a little embarrassing but I thought it was great. But my wife is sensitive to others feelings, and she didn't bring any attention to the fact. You probably will have to just let him be, and let him come to his own conclusions. Give him time, and don't bring it up and his ego will heal.
Cripes, I sound like Dear Abby or something!