This is so true, especially at the dog park. Having a mixed-breed rescue is a badge of honor there.
A lady was telling me about her purebred lab. He looked so pathetic conformation-wise as far as labs go. I asked what she paid for him and she said "Oh, he was free." I wanted to say, "That's good , because he ain't no purebred." but I kept my mouth shut. I have to do a lot of that at the dog park. :)