"Guests could certainly set a good example to the few ego driven floor singers, who consider that they are so talented that they do not have anything to learn from listening to anybody."
A good point. I can't count the number of times club regulars have performed and then headed downstairs for the bar when I go on.And I've seen it happen to other artists of different musical persuasions I have gone specifically to see. Or, as recently happened, actually ostentatiously pack their guitar beside me after my introduction and leave!
I once stood at the bar with a pint as a floor singer made disparaging remarks about me, even though he didn't recognise me, and had obviously never seen me perform.
I'm afraid we have to accept that there are always mean spirited people about, but the folk world I've worked in doesn't have too many of them thank God, and such incidents are indeed rare. And after a few thousand gigs it's hard to have to sit through songs you've heard a few hundred times before.
Have mercy!!