Many of these haters have astigmatism, which makes the dark mode hard to see for them. I don't think all of the people who have this realize they have this, so, it gets directed against the dark mode itself.
fascinating… I have severe astigmatism and I exclusively use dark mode always, the opposite is hard for me. I did not even know that many people with astigmatism struggle with dark mode
Maybe there are other factors too, I'm not very sure. When there are thin light lines on a dark background, that's really hard to look at for me. And strangely, the same dark lines on a light background don't bother me at all.