PDT - I know that I should have ended the TM session with WW earlier. But I've always believed that when someone is seething with rage and lobbing insults, the best thing to do is remain calm and not sling mud back.
No, the best thing to do is to END THE CONVERSATION. It's a boundary: "I will not engage in a conversation with you when you are seething with rage and lobbing insults." The remainder of your text conversation back and forth was nothing more than a combination of trying to "teach" her (and you can't teach a wayward) and simple tit-for-tat. In my opinion.