yes he smashes things up but that's not what she's accusing him of
The case is JD accusing AH of lying when she says she was a victim of his abuse.
Whether or not she also abused him does not form part of the jury's verdict.
The jury will decide whether or not it is a lie that JD was ever a perpetrator of abuse towards AH.
He cannot win this case so I can only imagine his goal is to convince people she was also abusive in an attempt to settle the score in his head.
But whether she was abusive is not part of the trial. He is not suing her for abuse. He is suing her for saying he abused her as he says this is a lie.
Even if you think he never hit her but concede that he smashed things up near her, verbally abused her (calling her names etc which is all on record) etc, then as a member of the jury you would have to rule against him and say that he cannot successfully sue her for calling him an abuser because he has at some point abused her in some way.
She may have done so too. She may have done so worse. That isn't what is on trial here.