The issue has little to do with an upper, middle and lower class existing and mostly to do with the widening gap between the rich and working class/poor and the middle class disappearing. It's natural for society to function to have a class disparity of some sort or we end up in a communist state, which has been proven impractical in the past. As I mentioned in this following post, it's largely about the widening gap between the rich and poor due to rising inflation and salaries not keeping up:
http://www.the16types.info/vbulletin...=1#post1315234
Basically, the rich are becoming richer and the poor are becoming poorer because if you do the math, it's pretty clear that salaries are not keeping up with inflation and that has been an on going issue since the 1950s. You can increase minimum wage to help deal with it, but it's just a band-aid solution for the real issue at hand, which is salaries are not keeping up to inflation. Our quality of life has decreased quite visibly and noticeably compared to the 1990s and it's obvious to see why. It's also a trend that has shown no means of slowing down and it is continuing at a steady pace.I think most of the ire and hatred is drawn towards the rich or upper class because they see the gap between the rich and working class/poor widening rather than shrinking. When you look at statistics, that certainly is the case in terms of inflation increasing:
https://inflationdata.com/Inflation/..._inflation.jpg
However, it's not just because of inflation, it's salaries not keeping up to inflation that is the real issue so this is where the anger at the upper class or rich lies because workers are gradually getting paid less and less in relation to the cost of living.
http://www.pewresearch.org/wp-conten...e_adjusted.png
Essentially, the main issue is that our salaries are not keeping up to the rising cost of living due to inflation:
https://i.pinimg.com/236x/be/14/36/b...-of-living.jpg
So 60 years ago in 1958, you can buy yourself a house at a third of your salary, where as nowadays that is obviously not the case.
In an ample amount of North American cities, renting or purchasing a home is not affordable because of the ludicrously high house prices, then add in the rising cost of bills, food and most items and it's not difficult to see that our quality of life decreasing. That is the main crux of the issue in the end, if our quality of life had remained stable or improved then this wouldn't be an issue, but it's a serious issue and we can't just brush it under the carpet that the poor and working class are envious of the rich when the gap between them is widening and there are numerous statistics that prove this is happening.