All of those things she lists are not really sexism. The only one that even comes close is the lady telling her not to wear a tank top. Honestly, I agree too. I think tank tops are not appropriate office attire. This girl just needs to grow up and learn that her appearance does matter. I feel like her manager was actually giving her some good life advice and being real with her.
If she's not customer facing, who gives a shit? Some of the worst, toxic behavior in companies is committed by men in suits