We 'gender' strangers in an instant. We gender them at 500 meters, at night, in the fog, and under other bad vision conditions.
The porn actor Buck Angel genders as male.
Pre-op transwomen gender as female. The pre-op status, though, attracts 'admirers'. But the admirers generally still gender the pre-ops as female.
On the weight of such phenomena, I have little hope for a genderless society. We all might as well learn to live with a society that sees gender as dimorphic.
Karen