I think someone upthread put it perfectly.
When some of our grandparents were children, buying a TV was a big event. The whole street would gather in one house to watch the moon landings. Now you have a house with 4 TVs in it, plus four laptops and four mobile and no one blinks an eye.
To buy a new dress was something for Christmas/birthdays. Now some poor person in Bangladesh gets paid 2p to make one and we pay the cost of a sandwich to get it.
To someone of that generation it's like saying, 'yeah we use 20 pound notes to wipe the floor. They really clean it well then we throw them in the bin.
It's like 'this person has more money than sense.'
But the truth is that a couple with professional degrees, e.g. a teacher and a social worker can not afford to buy the house their Factory worker, plus housewife grandparents COULD buy.
They hear the grandchildren say, boo hoo, we can't afford a house. And they're thinking, you rent a house with twelve TV screens, new Primark clothes every month and think: surely if you weren't so extravagant/didn't use £20 notes as floor rags, you COULD afford it.
The multiples of average house price and average salary are not what they are thinking of.