Yeah, beating the **** out of someone, particularly someone that is smaller than you, and taping it (for posterity, most likely) due to him calling you a bitch is certainly understandable. Those two innocent little angels should be left alone, and the rotten l'il bugger than called her that vicious, evil name should be drawn and quartered! Off with his head!!!!
(The above is all in purple, I just didn't want to do it over again.)
In all seriousness, regardless of whether the boy called her a bitch or now he did not deserve that kind of beat down.
And we don't know the whole story? Considering the actions these two "girls" did, we know enough. They are thugs.
Considering all the mischief you get into, it's safe to say that they didn't follow in their mother's footsteps.
Just kidding, of course. You're a great mom!