The key for the performer who becomes a non-performer is to keep showing your interest for the music being played, if the guy who is a pro musician has no interest for the music being played it sends a message to the audience why should they.
Monk's Casino that i saw a month ago was a very bad example of awful behaviour by musicians, , they couldn't stop talking while the playing was done by only a part of the band and you had the impression they were going through the motions.
Regarding clapping , it annoys me when audiences claps every insignifiant solo during a set, especially if the pieces played are almost chamber music like or ballads. It sounds more like people wanting to hear themselves than actually appreciating the music.