Here is my view - I do not think it is okay for any individual to hit anyone else, regardless of the circumstances. I'm completely against all types of violence, including domestic violence between couples. I was recently beaten up quite severely by a girl but I didn't retaliate because I am against violence. I'm a pacifist. The only situations that justify violence are those where one needs to defend him- or herself against grave bodily harm, to preserve their existence. Self defence is always justified.