SGB beat me to mentioning Girlschool. I used to have arguments with my brother in the late 70's over his view that women couldn't play drums because "they don't have the physical strength to do it properly" so I was most chuffed when Girlschool became one of his favourite bands and he had to eat his words...:o
I think that a fair number of men do tend to be geeky about music, but in the same way that they can be geeky about cricket stats, or science fiction, or cult comedy shows, or any other stuff that floats their boat. From a personal point of view I too am nerdy about music, as are lots of my female friends (possibly why they're my friends) so it always surprises me when blokes act surprised that a woman can be 'into' music in the same way that they are. I don't see it as a 'boy' thing, but there again I have met women (and men) who just aren't into music and I confess I tend to regard them as strange and slightly pitiable...
It does annoy me when you get a programme about music and it's wall to wall bloke, either as panellist or talking head. What used to really piss me off was that the only woman pundit who ever seemed to get any air time was that godawful gobshite Emma Jones who talked utter bollocks with that air of authority that only the terminally stupid can achieve. I don't think she did future female music commentators any favours whatsoever.
And now I'm trying to think of a female music journalist other than the terrible Jones person and apart from (briefly) Julie Burchill, I can't - and the only reason I think of them is their annoying gobshiteyness. Whereas I can recall articles by Steve Sutherland, Paul Morley, Ian Penman, David Hepworth, Mark Ellen, Neil Tennant (showing my age now) et al because they made such an impact on me.
As for music marketed at women - I confess with deep shame that I have a cd entitled "Music for Housework" which depicts a woman doing a Pete Townshend type pose using a mop for a guitar, which I bought because it had one track on it I needed for a mix tape I was making (this was before downloads so I had to buy the whole bloody thing). It is a horrible, cringey cover and indeed a bloody awful concept and I hate that I own it.
And... and... (I'm on a roll now, can't sleep!), I hate hate HATE films like Hi-Fidelity that promote the idea that music is a boys-only thing and only blokes will have their top 10 xxx-genre lists, and only blokes will make mix-tapes or like music that isn't 'easy'... grrr....
God, that turned into an essay. This is all because Record Mirror turned me down for a reporter job (despite writing to tell me they liked my turn of phrase) in 1981 - I've obviously been repressing it all these years :o