As for Trump's disapproval ratings with women, there are many reasons for that. A major part of it is Trump's rhetoric, but I wouldn't say he is running a sexist campaign.
Would him just being sexist in general be a sexist campaign? Because it's not like his campaign's goal/focus is built around anti-women issues. Trump himself is just a casual sexist. Though, I guess it is fair to say I am still divided on whether he is a true sexist or he just generally thinks he is better than everyone else
(and treats them accordingly, as the Trump way of life demands)