Do you struggle with facts?
Preconceived notions based on the sex of a person is sexism (especially when it's about their psychological disposition and not just something they definitely can't change, so it's even worse), do you struggle with facts?
It's like saying woman are dumb at math's and should not be in the class, a common 19th-early 20th century pile of bigotry.
It is the inherent nature of women

In some immigrant communities it's at a level that would probably have you near a thrombosis. Generally speaking it's now far less palatable to many than it was 20 years ago however, so I doubt amongst white British it's any more "in" than it was of yore....`Tis just the way it is, and always will be.