I suspect resentment stems when it is perceived that standards are lowered in order to appoint candidates from protected categories.
Regarding universities and the push to get as many young people as possible into university, I do think it has resulted in lower standards. Grade inflation is absolutely a thing....and students now going to university have to be taught how to structure and plan an essay, for example. Obviously some of this is down, also, to the fact that students are now consumers and universities have to attract them in order to survive, regardless of their suitability.
Social engineering has all sorts of consequences and sometimes the more negative impacts are not known until after they've been implemented. So now, we have come to realise that going to university is not the be all and end all, and that university education guarantees nobody a well paid job -- plus now young people leave with a lot of debt. Whereas traditional skilled tradesmen and women can earn good money and never be short of work if they are good enough. Not everyone is naturally academic.
Social class is an amporphous concept and it is difficult to categorise using traditional measures. Is it about income, is it about education, is it about culture?
Societal values shift and change and with it the priorities of governments. The job of journalists is to critique that.