I learned from performing in public that if you make a mistake, just keep on going. Many times, the only one who heard the mistake was me, because I knew what the song was supposed to sound like. When I was complimented on my performance, I said "Thank you.", not "But didn't you hear the flat note?"
With quilting, it is the same. I don't point out my mistakes. I say "Thank you" to every compliment I'm given. And if someone point out a mistake, I just tell them it's my humility block -- as the Amish say, only God creates perfection.