Well gender is part of someone's identity, so it's important to get it right. If you misgendered a person in real life, it might make them feel insecure about their looks and features and hurt their self-esteem. (a man might for example wonder if he is acting feminine) It's also more important on the internet and communities like this one which are commonly stereotyped as a boys club where male is the default and females are unicorns. (Also since pedantry is the current topic, allow me to point out that a typo refers to an unintentional error while transcribing, not spelling mistakes or using the wrong term, which while mistaken, are done consciously)
If your feelings get hurt because someone somewhere is talking about something you wrote/did and happens to use wrong gender when referring to you, you really need to seek therapy. Sure English sucks as a language since you even have something as stupid as gender specific pronouns, good (and proper) languages do not have such non-sense, but alas we are stuck with shitty language to use while communicating on the Interwebs.
Still, you should have something better to contribute than just go around fixing these small mistakes.
As for "boys club", I'm sure most men in all fields of engineering would love to have more women be a) interested in it b) working in it, but women seem to be drawn to different fields and it's not going to magically be better if you go policing comment section(s) on online forums. It's even gotten to point where in everything you read these days when people are referring to any imaginary person (like user does something or another) they always talk about "her" and "she" instead of even more ambiguous "their" or "user". What I'm trying to say is that your agenda is already been pushed on multiple fronts, trying to call people out for using wrong gender in a random comment is just silly.
> ...I was wearing a skirt...
> posted by Pam Mandel