"Don't try and talk to me while I'm trying to listen!!!"
Here here!
That realy is most annoying.

I got sneered at for my music stand(trying to play some very basic chords for someone who was realy desperate)By a realy good performer who had very copious amounts of "wall paper" stuck on his guitar.
I was a bit suprised but then I dont have the experience of thirty/fourty/fifty? years of experience like some of you.
I agree that it is better to know your song and the resultant performance does seem better.
But what if I bloody forget??????
Arrrrgh!
Just playing at home is probably best bet if you are not a "Pro " slummin or networkin for gigs.