I have to disagree with that, or else I'm misunderstanding you.
Are you really saying that if some person does not see a problem, then this by itself is proof that no problem exists ?
It is true that sexism is far from constant, and I agree with the assessment of others that women clearly aren't rare or considered outsiders by default at CCC, I attended their camp in Berlin a few years back, and though women where a minority, they where not a tiny minority. There was also several women among those leading workshops and giving lectures, and I do think that overall the atmosphere was inclusive and welcoming.
But that's not to say that there was no problems, there sure was. Was there *less* of a problem than in many other locations and environments ? Yes ! Was there "no problem" ? No !
I'm pretty sure that's true globally. Levels of problems vary wildly, yes, but I don't think it's plausible that there's anywhere where it's a fair description to say "problem solved".
And I say that coming from one of the countries on the planet that consistently score top on equal rights.