>>49383243>>49383328It's not so much what was normal for real people, as much as what their notions and stereotypes were. I think that's still true even today. Imagine what you'd consider the girliest girly-girl to be. As traditionally(emphasis on that) feminine as possible. Now, imagine a girl who's the opposite.
At her age Misty just needs to be far enough toward the latter outwardly(hobbies, behavior, how she dresses) to be a tomboy. Especially in a simplistic kid's show setting, where gimmicks/labels are a good 70~80% of who a person is.