a couple things here;

1. you care why?

2. you most literally can change the rules of language on the fly. that's kinda how language works and is created.

edit: removed the last comment as the previous guy was the one going on about sex first, regardless, differing levels of hormones can often influence this, considering males can have varying levels of estrogen and vice versa for females and testosterone. other animals often portray characteristics opposite that of their sex, as well.

this is just an odd thing for you to care about. why wouldn't you instead let people live their life without your criticism when they clearly are having trouble parsing their place in life and their understanding of themselves.