I totally agree with many descriptions on this thread.
I know 2 families with what I would call spoilt children, both spoil their DCs in different ways but have equally bratty children.
Family one is a woman who is a single mum with 3 children; the eldest is 13, middle one is 10, youngest is 5. All of the children are very overweight as she never says no to them and they are allowed to eat what they like, when they like. I have known the eldest to eat a whole frozen gateau to herself when we've been round their house and then eat 2 or 3 packets of crisps. This was after a meal. They are not disciplined at all and are rude and obnoxious, never uttering please or thank you or using any other even very basic manners. When she has been round our house her 5 year old totally trashed my 2 DDs bedrooms, to the point that I would actually describe it as vandalism; furniture moved, duvet covers drawn on with felt pen, writing on the walls, DD2's hair accessory basket tipped out and hidden around the room, clothes pulled out of wardrobes, I could go on for hours. The 5 year old refuses to ever have her hair brushed or combed and as a result has hair like Russell Brand and is crawling with nits. They are constantly rude to the mum and she just ignores it or says 'oh you're such a sausage'. She describes them as 'wilful' and 'very determined'
Family two is a family with older parents and one DD, who is 8. Said 8 year old is very very spoilt materially to the point where she doesn't appreciate a thing that is bought or done for her. You can almost see in her face on my friend's FB photos that this girl doesn't appreciate a thing and is thinking 'What am I getting next?'. She has hundreds of presents at Xmas and birthdays, lots of holidays, lots of outings, and does lots of activities, basically she is never told 'no you can't have/do that' and consequently she doesn't appreciate or understand the value of anything. She won't share with other children and does an awful squealing noise if she can't have her own way, such as when she is out of a game at a party. We went out one evening with this family and they took their ipad with them for their DD to watch a film. My 8 year old of course wanted to watch it too, but their DD kept holding it up against her tummy with the screen facing inwards, and in the end the mum took it off the as her DD 'didn't want to share and wanted to watch the film by herself at home later'. If she was my DD I would have let my DD watch it and refused to let her watch it herself at that kind of behaviour but her mum didn't seem to think there was anything wrong in how she behaved.
Needless to say I give both these families a very wide berth