It's pretty mild; but someone sent me a twitter message after finding my GitHub account (hey nice projects, etc....) The left was my profile pic at the time, and the right is their final message. The fellow with a beard is my little brother. :) http://i.imgur.com/UuQMpi2.png
In the name of fairness; was your screen name gender neutral or leaning towards masculine at the time? If it's the same as HN (Mr. RRGN, right?) I could see it being a simple parsing error! ;)
Although not a certain identifier many people do rely on screen names to discern gender. I ask because if HN had avatars and I had a picture of me and my sister together, with my current nickname, people would likely assume I'm my sister. Even if the photo focused more on me than her (like your profile pic focuses more on you than your little brother). Simply because my username is a female name. Furthermore, without knowing we were family, many people would also assume we were dating. A mistake that actually occurred at school quite frequently from people who didn't know us, since we were nearly always together.
I'd understand the mistake. Of course, I'd correct them after. But I wouldn't take offense at the mistake. It's silly to expect people to know everything about you (even if you have a bio! Not everyone actually reads those.)
I've been mistaken for a girl even when using a picture of myself and only myself as my profile. The individual who made the mistake actually thought that was a picture of "my boyfriend" and I had a night full of laughter at the mistake (as did they after I corrected them).
I've been asked by online friends if I was male or female - months after meeting them - because it never usually gets brought up. I always ask them which they think I am before answering, out of curiosity, and most of them believe me to be female. I guess I need to cut down on my use of emoticons in shorter text forms and work on speaking more manly? I don't know.
I have a hard time seeing scenarios like this as sexism rather than honest mistakes that simply happen...
E:
My real name is a name used by both genders but more predominately by females rather than males. That probably contributes to the confusion over my gender to those who know me long enough to learn my name. I never actually thought about how my name contributes to the confusion until I typed up this post. I can see why people who attribute my name as a feminine name would think I'm female. Enlightening in a small way.
That's a valid point! It could be. I wasn't offended, but it's an anecdote that supports the idea that women aren't seen as being programmers. Other examples: going to conferences and being asked if I was covering it for a blog. Also not a big deal, but it illustrates the stereotype.
Likewise, if a man goes to a nursing conference, or a conference for elementary school teachers, he will likely face the same sorts of misunderstandings.
I wasn't trying to imply this sort of sexism doesn't happen. Woman being asked which man they are attending a Hackathon with happens frequently! The assumption being they aren't attending on their own or aren't hackers, etc.
I was more worried about cases where genuine mistakes being clumped with sexism when they really shouldn't be.
Seems to be more about premature stereotyping than sexism, if sexism is supposed to mean something like "the belief in the superiority of one of the sexes". There is nothing inherently superior, or good, about being a programmer on GitHub. Some people have other goals, hopes and aspirations, without that making them "bad" people.