Flip the table. Anger. Disgust. Judgment. Indifference.
If you want to be nice you can always keep your doors open to resolution. But it makes no sense whatsoever to give away mental and emotional real estate for free to donkeys and assholes. It’s simply too valuable and you should cherish it for yourself.
You might think indifference is the weakest of what I’ve mentioned. But being ignored is extremely painful. Aurelius wrote that this is the default goto if you don’t have a witty comeback.