Not the person you replied to, and I read the book years ago so the details are fuzzy, but I don't think there's a clear-cut answer to your question. We effectively see everything in the book from Stoner's perspective (although it's written in the third person, grammatically), so there's no clear separation between his perspective and the author's. My feeling was that Edith was hard done by, and I would definitely understand someone seeing her as a misogynistic caricature. But it's hard to generalise: this is Stoner's story, so of course the most nuanced and sympathetic portrayal is of him; and anyway, it is the author who shows us enough to make us feel more than just contempt or pity for Edith, and even to feel frustrated by the superficiality of the portrait he has painted of her.