I was at one of those gigs before several years ago. Possibly because the volume was too loud, or the music generally too discordant but about 85% of the crowd went upstairs to the chill out room for the majority of the set. I remember a distinct "nope" feeling. The artist himself was off stage twiddling his knobs too.

Those who remained were selling merch, behind the bar, or stood at the back with arms folded.