It'd be great if it worked, but it's pretty clear that it doesn't if you go to the tags terfsafe and transandrophobia on tumblr (under "latest" to get the most variety of posters). About 5% of the posters in the terfsafe tag, at an absolute maximum, are marked red, but 30-50% of the posters in the transandrophobia tag are marked red. For reference, transandrophobia is the word used to discuss the unique oppression, discrimination, and experiences that trans men and transmasculine folks face.

I didn't think to check intersex tags, but I've noticed quite a few intersex people I follow are also marked red despite there being absolutely nothing warranting it on their blogs.

So disappointed.