One of the most ill-mannered examples of heckling I have ever encountered was when two Irish women singers were booked to perform at a West End of London Club
One of the singers, an Irish-speaker from The Aran Islands, began by giving a short explanation of her Irish-language song
We were, unfortunately, sitting two rows in front of a 'veteran' folkie, who proceeded to talk, loudly and very pointedly, over her introduction.
When it happened again on another song, my partner turned around and asked him to stop, to which he replied, "I came here to listen to singing, not talking - I thought we'd got rid of all that shit in the '60s"
Someone came up to Pat in the interval and said, "I'm glad somebody had the courage to do that"
Jim Carroll