Black Knight: Tis but a scratch. King Arthur: A scratch?! Your arm's off! Black Knight: No it isn't. King Arthur: Well what's that then? [Pointing to the knight's arm lying on the ground.] Black Knight: I've had worse. King Arthur: You liar! Black Knight: Come on then, you pansy! [Charges Arthur, who chops the knight's remaining arm off.]
Medium of communication is irrelevant in American defamation laws; even an email sent to a single person can be libelous. To be libelous (in the United States), a statement must be false and damaging to an individual or corporation, and the person who made that statement must have been at fault (i.e., known that the statement was false, acted recklessly with regard to the facts, or otherwise been irresponsible). Whether a person makes a defamatory statement on a blog, in a newspaper, or on Twitt…
Sorry that you're wrong but I can't really help that. If this was a male MMA fighter that attacked a woman he would be changed with assault with a deadly weapon. Defending yourself with a weapon in this case would just even the odds.