Not a folkie, or even a musician; but novelist Evelyn Waugh a v notable example: e.g. invited by mutual acqutce to meet admiring American visitors, the female one of whom started telling him how much she admired Brideshead, he replied, 'Yes, I have always thought well of it; but now I know a stupid, ignorant American woman admires it perhaps it is not as good as I thought after all'; & then proceeded nonchalantly to eat his dinner as if unaware of extent to which he must have ruined entire occasion!