OK, jokes first: Steve and Callum, how funny that was. Laugh? I thought I'd never start.
Steve, my son attended a wedding just like that recently, in my opinion, it's somebody not doing his job properly. Not good.
Pete and Daz, total agreement. In particular, Charlie is a shinng example of someone who has listened to the good advice he has received, and quite a few on here might do well to follow his example.
The problem is that there are so many variables. You could have a young DJ who is old beyond his years, as Charlie seems to be with his musical choices ( sorry mate, it really tickles me ), or you could have the over-the-hill DJ desperately trying to recapture his lost youth, getting all down and trendy with the Yoof. ( Hmmmmm, good job there's nobody like that on here, eh? )
I really think this in particular is the one scenario where you can't generalise at all. All I will say is that experience, enthusiasm and knowledge are priceless. Smugness, weariness and bad attitudes are unacceptable.