I think it's perceived, with credible justification, that we don't really live in a Capitalist society, of the kind which used to be envisaged and celebrated.
Many people think that big super conglomerates hold the power and that there are not really the same opportunities to work hard and do well and build up a business from nothing as we are used to believing existed: 1900 - twenty off years ago. There is also a sense of graduates not being able to get jobs and ridiculously difficult selection and interview processes and lengthy internships on zero earnings. So the situation is seen as getting even more restrictive - instead of open, and opportunity-giving, as it used to be seen.
You read historic success stories of little bakeries setting up a delivery round, 100 years ago and then expanding to produce and market tins of biscuits and then becoming a household name for manufacturing these and confectionery. It feels as if anything then was possible, if you borrowed a little money from a relative and worked very hard. I read the Tunnocks Biscuits story (Scottish firm) which is exactly, on the face of it, that inspiring example of what Capitalism can be. The sense of freedom to be creative and make a product and grow from small to big gives hope and a sense of excitement. A lot of people feels things have changed and that there is too much influence - over supermarkets, etc - in the hands of a few powerful forces.
A lot of middle income people are more Left- leaning - certainly in the big cities, where they see disparity. They feel that opportunities need to be shared out a lot more through government policies. They feel that they can only be happy and comfortable with their adequate incomes, if they see others having some good opportunities too. This equates to a quite common professional person attitude in the big cities.
The threads about staffing crises in schools show how today's children are not being served well and this seems fundamentally unfair. Then there is the difficulty of according childcare which stymies attempts to go for it, earn and support your children. Its a lovely thing to have money, if everything is seen as fine and equal, it's like being a player in the successful Lionesses football team, it's all a tribute to effort and perseverance.
Without blaming the individuals who have got themselves a high-paying job, because they have only done what it's best to do, which is to work hard, and to help Society with their nurtured and excellent skills, many think it's a bit tone deaf, I suppose to post about what you say.