Would the use of 'in' be considered wrong in the following sentence? (Or does it change the meaning of the sentence perhaps?)
This is a gentleman's club - women don't belong here.
This is a gentleman's club - women don't belong in here.
The use of "in" suggests more their belonging in(side) a certain place, and although the meaning of the sentence isn't changed much at all, I would in this case not use "in", as it sounds more natural: women don't belong in the club, as opposed to the building itself.
[Not a teacher]