You will never hear someone calling a man a “fangirl” unless the person saying it is a misogynist trying to insult that man’s masculinity.

This is simply not true - hence providing the genderless definition. If we aren’t caring about pedantic aspects like definitions, I also see it used constantly to describe men without insulting their masculinity, often as a self descriptor. For example since it carries far fewer negative connotations than, say, Otaku (a term that has fallen out of favor due to it’s original Japanese meaning…) it is commonly being used in place of former phrases like “going otaku” Perhaps you and I simply have wildly different cultural experiences, and you have not seen this?

and still reaching false conclusions

Alright, and while you have told me this is false repeatedly, I can point to where the standard non-academic authority for english definitions shows it’s sometimes a genderless term. I have seen no actual evidence that I’m wrong beyond you coming in to assert that I am. And while that may be pedantic, it’s not terribly pedantic nor hostile since my entire point has been that both users were using the term correctly, and that use of a gendered term is not in itself inherently misogynistic.

I’m not sure what about those you’ve got an issue with but I am genuinely curious about your thoughts there.