I was about to get all uppity and say how horrible it is to judge and then remembered..... 
One year we were invited to friends of mine. I asked what we could bring not least because we had two DCs 10 and 8 and DH is vegetarian. Told it was all in hand and just to bring 'decent' wine and some chutneys for the cheese board.
We brought 6 bottles of real champagne and 6 bottles of the wine I knew they drank (Waitrose picpoul- about £15 each). I also brought a hamper made up of chutneys, homemade truffle chocolates, and a gift for each of the hosts.
They served a ready meal from Asda, which was fine in itself because I thought maybe they were not confident cooks. But it was an individual 'roast dinner' ready meal except for DH where they pooled some of the veg from the other ready meals onto a plate for him (with gravy juices).
They expected total silence from the children. Eventually I asked if the DC could watch a film on their dvd player which I had thankfully brought with me and they sad no as it would be 'too loud' and that the children should be expected to sit there at the table silent while we had adult conversations and then watched the Queen's speech.
They are only 5 years or so older than DH, so it was not really a generational thing (and tbh, you would think most people would be pleased if the kids could go amuse themselves while the adults finished off the wine and chatted). A few days later I got a text message outlining how disappointed they were with the children clearly being bored and suggested that we teach them some manners.
It was fucking miserable.