Final braincell's feed

I just don't understand something. Why do authors always portray the children like that these days
( ̄へ ̄)the boys timid & shy and the girls so outgoing & powerful. While i do understand that nowadays everyone is trying to break the srereotype and the authors don't want any future problems but still i've been seeing this everywhere ┑( ̄Д  ̄)┍