Because "he" is grammatically correct when the gender is unknown.

Is it really? Also when the username contains „girl“ it may give a hint.

https://en.m.wikipedia.org/wiki/Gender_neutrality_in_languag....

But I was noticing that the username was “filmgirl”.

Fair enough!

Well The Times They Are A-Changin'

My friend sold boats for over 10 years. He said women love going on boats, but he never saw a woman buy a boat in his life.

Women love apple products, but if you look at who is splurging on multiple high end apple computers with multiple monitors it's gotta be 95% male.

But I was noticing that the username was “filmgirl”.