I shudder whenever I read stories like this. They just go to show how people react behind our backs. Doesn't matter if it's strings or full on dressing to people like this, IMO. I bet these guys would never tell the string-guy how they feel to his face, would they.

I also think you should say something. At least you'll sleep better. But honestly I don't think that anything you might say will fundamentally change their opinions. They are too deeply ingrained.