First . Davey should have been warned in advance that there would be special people in the audience. The responsibility comes down to the organisers and nowhere else.
it is very easy for an artist to make a mistake on stage as i am sure every live performer out there has at sometime or other wished he/she had never opened there mouth if you say it never happened to you then you are either lying or perfect..
I've known Davey for many years now (no i'm not a freind just an occasional employer) and i am sure he is horrified at what he said. and yes threader you should never have mentioned his name..
i personally would have made a bit of a fuss of them and sung something specially FOR them and then continued with my spot. they have a right to be there..
the wife says ive got to go so i'll check back later. Graham(Guernsey)