Summary: The revolutions have begun, taking America into realms with few or no historical precedents — normalizing prohibited behavior, breaking unquestioned rules. Films and TV show women hitting men (even in cute rom-com couples). What happens as this becomes accepted in society? Will domestic violence increase? How might this change relationship between the sexes? It’s not an April Fool’s joke, except perhaps on America.
Ancient mores say that men should not hit women. This rule limits the action in film and TV. Good guys can fight bad guys but not bad women (except lightly). Even fights by good girls often are limited because having girls hit by guys seems too violent for many viewers (see examples at the TV Tropes page, and the far fewer exceptions on this page).
Corrosive to this rule is women casually hitting men — often for trivial reasons. It has become commonplace on film and TV. Men can only cower before the righteous rage of grrl-power, since striking back would be wrong.
Here are a few examples of casual girl-on-men violence, starting with two of the odder examples of grrl-power: women abusing their boyfriends. It’s so cute, especially for action-adventure heroes. Afterwards is some speculation about what it means.