Confusing 'woman/women' drives me up the wall, and it's more common than it should be.
Man is singular.
Men is plural.
Woman is singular.
Women is plural.
There seems to be a lot of plural perversion going on. First it was forming plurals with an apostrophe .... but now it's dropping the plural altogether. Can't count how many times I've seen posted something like:
"Leftist are like that"
I dunno, maybe schooling was abolished recently....