Published at LXer:

Despite the values of freedom and openness, the free culture movement’s gender balance is as skewed (or more so) as that of the computing culture from which it arose. Based on the collection and analysis of discourse on gender and sexism within this movement over a six–year period. I suggest three possible causes: (a) some geek identities can be narrow and unappealing; (b) open communities are especially susceptible to difficult people; and, (c) the ideas of freedom and openness can be used to dismiss concerns and rationalize the gender gap as a matter of preference and choice.

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Let's consider some observations (I won't call them facts):

-A few people in a few online FLOSS communities are sexist.
-Women in general are not interested in computing, and a very small proportion of the ones that are use Linux.

How dose this imply "free as in sexist" ?

Well, if you want to find out, read this long essay, which is mostly padded with meaningless words and statements arranged in a nonsensical order.