Obviously not all married women but I do know a few who do look down on their single friends.
I remember there was a troll on a forum (not a particularly harmful one) and a lot of the ladies commented saying "at least I have a man", "at least I'm married" etc.
Like life could only be complete unless you are married and it is some elite club.
It's a little like that smug married couple scene from Bridget Jones, where she's asked why is there so many unmarried women in their 30s these days?