Yes, he interrupts, and is also often rude to callers who are clearly nervous and unsure how to behave on TV, so have their TV on or noises in the background.
I know he has limited time and sometimes callers go on a bit (saying hello to everyone and so on), but he is often quite disrespectful to people who will probably be being heard by friends and family. To them it is a moment of 'fame', and I think it's unkind of him to behave like that.
A thread for people who have been on GN a long time

.
