Aren’t they still?
scratching dandruff off of Gray balding head
No. Since the 1990's, top-tier universities began pushing "unisex" dorms, with males and females on the same floors and sharing the same bathrooms. Smaller colleges began following suit. These days, it is mainly the strictly religious campuses that still separate housing for the two sexes. And the latest trend with segregation on campus is "persons of color" demanding separate dorms from whites. Full circle there.
But of course, with gender now being mulitiplied and biological sex erased from the minds of our highly educated betters, I don't see a re-emergence of sex-segregated dorms again any time soon.