OK, I found the screen shot. 05/27/2016

Some guy JD (who disappeared shortly after) wrote: "I asked you never to address me again. If you do it again, we're likely to have problems. Do you know what c-hack is? No. Keep antagonizing me and..."

(I might've conflated the part about "casuistry" with something else. Not sure.)

Could forward the screen shot to Civil Comments for anyone who, like Tridentinus, calls me a liar.