Insofar as your observations are correct, they're a simple tautology: obviously CS has become a "boy thing" which girls avoid; one needn't look further than enrollment statistics to confirm that.
The question is rather, "Why is female enrollment in computer science dropping, while things like, say, organic chemistry graduate more women than men?"
Your argument implies two fatally flawed notions: That gender roles are static. Obviously they're not. 50 years ago women didn't become doctors, because that was man stuff. The other is that girls avoid the hard boy stuff because it's not very girly. But it's specifically in engineering, physics and CS that there's such a huge gap. It's for the most part not there in biology, chemistry and mathematics.
The question is rather, "Why is female enrollment in computer science dropping, while things like, say, organic chemistry graduate more women than men?"
Your argument implies two fatally flawed notions: That gender roles are static. Obviously they're not. 50 years ago women didn't become doctors, because that was man stuff. The other is that girls avoid the hard boy stuff because it's not very girly. But it's specifically in engineering, physics and CS that there's such a huge gap. It's for the most part not there in biology, chemistry and mathematics.