I've noticed people in singarounds who like attention when they're performing, but then natter, albeit quietly for the most part, when someone else is performing.

On a related matter, at a gig with my (fairly noisy!) zydeco band at a pub in Whitstable last year, there was a bunch of blokes who stood near the band and right in front of one of the speakers. They (and one bloke in particular) talked all the way through the gig, and didn't applaud or even recognise the existence of the band. It didn't affect the gig much, as the PA was louder than their voices, but it just seemed curious to me that they decided to stand there rather than in other parts of the pub which were much quieter and, presumably, more suited to conversation.

And, blow me, at a gig later the same year at the same venue, the talkative one was back again in exactly the same place and did the same again! It's beyond my ken!