I'd also point out that the "flying cars" of science fiction generally either explicitly or implicitly involve some sort of anti-gravity. In the 1960s, the idea that some sort of anti-gravity would be possible in the future wasn't so silly. It just seems to be the case that we're not going to get it. (Even if physics turns something up that can be used for it, the crazier the physics necessary to invoke it, the less likely it is to be practical.)

I'll be honest, when I see "Where are my flying cars?" used seriously, not just as a "ha ha" sort of thing, I dock a lot of points. It's fashionable pseudo-intellectual claptrap.

Real science fiction has discussed all sorts of things, and yes, that actually does include women in a wide variety of roles, including giants of the field like Heinlein and even TV such as the original series Star Trek, and I could keep going for a very boring amount of time.