Somebody singing a song you are not thrilled with, due to lyrics or style, is a time when you can get up quietly and go to another room to get yourself a drink or visit the loo. There's no reason to disturb those who are enjoying it. I like to leave during loud songs so I can hear it from wherever I am. Then I wait in the doorway until the song is over before heading back to my seat. Talking loudly while somebody is singing or playing seems an egotistical belief that my taste over-rules that of others who may differ.