Taking all this onboard, this is why all user uploaded avatars are gone. That leaves the site with the default male, female and other icons (these will be male, female and other by weeks end). This changes a pages maximum of 80 avatar requests to 3 (resizing a single type avatar) for reuse.
Why bother with a grey gender other box then?
Survivor / Supporter makes more sense for sorting if that is helpful. Does gender matter? Not to me. What is relative in scrolling through posts?