Well, as much as I hate to say it, most people are so busy looking for their turn to talk that it wouldn't matter how interesting what you're saying is.

Which, I get. I'm not immune to eventually losing attention to unfamiliar material. But that's why you listen; you pay attention and ask about what they just said if you aren't familiar with it. If nothing else, let your brain perk away while you listen and wait for it to ring the bell of association! Until you get into some really arcane subjects, there's almost always going to be a point where something relates to something you already know, so it's just a matter of being patient.

But, sadly, I think you're right. Women simply get ignored, even by other women. Doesn't matter how much they know, how high their degree of expertise is. People tend to rank anything coming out of a woman's mouth as less important. It certainly isn't the entirety, but I would agree it contributes, as you said.