I think there may be something to this, but the women who complain about it are looking at the wrong people.
The problem is not the men, the problem is that they're not as qualified as the men, and that may (in some cases - edit: those were they would otherwise be great engineers) be a direct result of their upbringing, so the real problem is the parents. Maybe they should look back to their parents and have a talk with them. There's more tho.
We'd all like to think that if our kid showed interest in something, we'd be encouraging and supportive, but that's not true. There are activities which we discourage, specifically because of gender and we aren't doing that because we're idiots or evil or hate the other gender, we do it because it's what's best for our kid. Just like someone else was saying in a previous post, we have to play the numbers game, and our kid's best chance of success is if he plays his own gender.
So in the event they do talk to their parents, they'll probably hear what they should have known all along: they had their best interest at heart.
That being said, if I had a girl and she showed interest in electronics, I'd encourage her, because I agree with everyone else here, girls are positively discriminated "against" in this field. Nobody likes a sausage fest.
Bottom line: There may be a few women who could have been happier engineers than whatever they are now, but that's really nobody's fault. That's just the way it is, some people don't fit.
Edit: Should go without saying, but just to be on the safe side, when I say "they're not as qualified as the men", I don't mean all women, just the ones that would want to work in the field but didn't make the cut.