For me, it would depend on many things. Do I know you? Do I like you? Are you an annoying person in general? Am I making this as a keepsake for a very important person in my life? Or is it a throw for the back of the couch in the winter? Is it something easy to fix? Is it a scrappy quilt I'm making for fun? Is it so obvious that it's ugly? Or does it add character?
I had a friend point out a mistake on one of my quilts, but I absolutely love how she did it. "Oh, I see you were creative and did this one different. " I looked and realized the block was upside down. It was a simple fix and we laughed about it.