It'a not. Where I work we are usually open for programming positions. Girls simply don't show up, it's not like there are hundreds of them that we send back home because they're women. When I'm on github and I fork something from supernerdy81, i don't even know if it's a he or a she, nor I care and surely that wouldn't make any difference in using a library. Just to say. It happens that men are eventually more interested in technology than women, generally. You can see it among your friends or family. There are things that attract women's interest most. It's not that knitting community is hostile towards men, it's just that few men (me, for example) are interested in knitting.