I don't think what you're asking is simple at all, and if anything it comes across as quite goady.
There's absolutely some bizarre double standards on here from some posters, especially regarding finances and relationships expectations.
However, I don't think you can say MN is sexist against men. On the whole the site centres women and gives women a space because socially and culturally women as a class come second to men and men as a class pose a much greater threat.
Men as a class don't have to worry about walking home alone. Men as a class don't have to worry about the impact of having children on their careers. Men are more likely to be paid more and be promoted quicker etc.
I've seen some worrying replies that have been described as being very netmums where posters are basically told that they shouldn't expect too much from their hubsand because he works hard and maybe he'd find her more approachable if she dressed up a bit for him.
Equally, there's some really low expectations of men in places where people actually go as far to suggest that those proposing a respectful relationship of equals (in terms of personal respect, allocation of household jobs etc) are living on another planet. At times people normalise men being a bit shit, complain (rightly) about men being a bit shit around the house, but then get outraged and accuse you of victim blaming for suggesting that maybe women should raise the bar and not accept being shit as the default setting of men.
It's almost like MN has a range of posters on it.