I don’t think “female” is offensive.
I thought it was offensive because some (supposedly female) users said it was offensive; but I didn’t understand why my female friends used the term (female).
I found another saying that it wasn’t offensive, and I immediate copied that belief.
LGBTQ+ politics is confusing …
Ive heard this is in relation to some guys preferring women as girls sexually but it being less common for people to prefer boys sexually. Also iirc that weeb moe movement focuses on girls not boys.