I find meal times with either set of GP's quite vile as they all talk with their mouths full and often across each other. Next weekend I have them all coming for a meal, so four adults all chewing and talking. It's really very horrible and hard not to notice. One of my dc's once told my Mum off for doing it (in the way I would if they did it) and my Mum was quite cross. I told dc that they shouldn't tell adults what to do, but not that she was wrong (she wasn't).
I have tried chatting to my parents about how someone I know talks with their mouth full and how surprising it is in an adult and they agreed. In fact they went on to pontificate about how horrible it is, so I guess they don't realise they do it.
So, I realise I should probably try not to notice and put up with it, but do you think there's anything we could do or say to stop it. Honestly meals are noisy and stomach churning.