I play smallpipes which are quite quiet and I struggle to hear myself playing in noisy situations, others may be able to hear me as the sound is projected away from me but I can't hear myself which is a situation that pisses me off. I expect and tollerate limited background noise so why shouldn't singers - at least they can increase their volume, I can't, unless I swap to GHB's in which case no one will be able to hear themselves! There is no excuse for what comes down to simple rudness either on the part of the talkers, singers or muzo's. Tolerate it or go sing or play somewhere else.