I guess it rather depends on where you are/were at the time. And, of course, how one defines the 'working class'. There are very few people who do not need to work and many of the traditional working class find themselves in the growing numbers of NOT working people. So blue collar, no collar, white collar, part time, casual or should it be rich and poor, tertiary educated or inadequately educated (if there is a difference).
In the UK it was the early 60s when, for the first time we came to our senses and told the 'aristocracy' exactly what they could do with their old school ties.
But some might say the galvanising time was the Civil War with Thatcher!