Agreed with Nakamachi being a disgusting piece of human garbage.
I know how ironic this may sound, but I honestly think that a major reason why she isn't called out for how horrible she behaved is because she's a girl and the author either still clings to those issues of sexism (perhaps subconsciously) or may have felt pressured enough to not write about it to the audience. It just leaves a bitter taste knowing that she's treated as basically a good person despite how bad she actually is.