My son graduated in May from Vassar - so not there at this moment, but as close as you could get otherwise 
He was not an athlete. He had a great experience, with a great mixed-gender friend group, including a very serious girlfriend. He also was a social science student. From what he has told us, he did not find the ratio awkward. I think it was just not much of a thing? Already in public high school he was used to the high achieving students in his classes being disproportionally female, so it was not a big change.
For what it’s worth, certain majors tend to be more gender balanced than others. There are lots of men majoring in history, international studies, and political science at Vassar. Feel free to reach out to me if you have other questions.