Urgh tell me about it. I’ve met and worked with a lot of publishers and while they will rabidly promote “diversity” as long as it’s of the LGBTQ+ variety, they are in fact almost all young very posh women called Harriet, Lucy, Sophie etc, with mostly male, but similarly clueless bosses. A LOT of them have no clue about basic grammar and punctuation and I feel like a 300-year-old bore explaining why “a lot” is not all one word etc. (I’m not even fussing about split infinitives and end prepositions - I’m not actually old-fashioned.)
There are exceptions but meeting a working-class person is incredibly rare. I come from a half working-class, half middle-class background and even that makes me feel like an outsider as a lot of people in publishing have very narrow views and experiences.
A bit like academia, the patriarchy is in full force in publishing. Young women with arts and humanities degrees join straight from university and work for a few years until they get married and start having children. Then they go part-time or freelance while men rise to higher ranks and end up in charge, and on the highest salaries. Not many publishing companies try to combat this (though actually Penguin is one of the better ones) so there’s a kind of conveyor belt of younger women who are poorly paid but from a posh background going in and out and never becoming more experienced. Of course some are lovely people, and some do buck the trend but as a PP said, both spotting grammatical errors and spotting shysters are typically not among their strong points.
It’s also true that when something is successful, publishing gets its blinkers on and just looks for more of the same until it becomes a huge cliche.