Most Helpful Guy
In my experience, most ditzy girls aren't actually stupid, but they're usually submissive. They like to give men the sense of mental superiority so they act very ditzy to attract men who enjoy feeling that way. I wouldn't say they're all necessarily smart, but most girls who act ditzy do it on purpose to attract guys.
Guys like it because they're usually very flirty by "accident", and it's very easy to start a conversation with someone who appears to be dumb. You don't have to impress them, and it's very easy to keep their attention.0