I've got a feeling if I said because it's dirty smelly and breaks your nails I'd get called sexist again
But not all women, want to do jobs that get them covered in oil or dirt or cement.
I suppose not all men do either.
But many women around me spend lots of time putting on those false nails you paint with pretty colours. ( not that I do
)
Men don't go in for that sort of thing, but being a dustman isn't going to do much for expensive nails
Bishops don't have the same issues
It's a clean job
It's a bit of a generalisation, but women tend to like clean jobs.
Not all, but in proportion.
Also dirty jobs like working on the road is seen as more butch.
However women often do housework and other dirty work.
Probably just cultural.
If you have spent hard cash doing your hair ( and women pay a lot more than men at the hairdresser) and false nails you don't really want to be out in the rain laying breeze blocks.