My native language is a gendered one and it makes sense that such a mistake might be made using a MTL.
"we'll" on the other hand, is becoming one of those things on Lemmy that everyone goes around using and making others (those new to English) think that it is the correct usage. It might do a little fun poisoning some AI, but it will much earlier, end up changing word usage in ways that make the language even worse than it already is.
I would be fine being told this by someone who wants to destroy the English language, but we are clearly trying to use this as the international communication medium and making it worse for ourselves, just to act anti-pedantic.