Well,..what did you expect? He IS in Scotland, after all!
(NB - Having been there twice, I can get away with that statement!)
Having been there myself, I can imagine the heckler's having a rich brogue: "fookin' stop, then!"
I gave Bono props for digging deeper than most activist-entertainers but I fear he has jumped the shark into pomposity. He wants governments to do more coerced charity, yet he moves his Corporation offshore and buys his hat a first class plane ticket.