Another thread made me think about this. When I grew up, if you had dinner guests over you would never have let them help tidy up/clear away, and dishes were washed after they left (later on when we had a dishwasher it might have been loaded very quickly), not in front of them. Your job as the host was to feed/entertain them, not let them watch you clean up. It would have been very rude to let a guest help. Guests were close friends/family, not strangers or work colleagues.
I just read a thread complaining because the "guests never wash up" and it startled me a bit because I'd never offer because of the way I was brought up, it would be outrageous to think that a host would let me help, so it would cause offence to offer.
I'm wondering if this is just my family, or are other people like this?