Not entirely - Sharp Electronics used to run a UK Service competition, which I won twice.
There was a separate catagory for women, and the same two were there evey year. One was an older women (probably around my age
but very nice), can't remember her name - but her and her husband were always both there, both in the Microwave oven section. In the TV/VCR section (which I was in) was the other woman, a very attractive young women called "Estelle Sandford" - and she certainly knew her electronics.
Not seen her for years now, but I've just googled, and it looks like she breeds rats now?
Looks like it's her, because she was always into caving (as was I), and other adventure sports (as I wasn't).
So it's not absolute that females and electronics don't mix, but it is rare.