Had the original post simply pointed out that America's incarceration rate is horrible, I would have no disagreement with it, but instead it chose to make a direct comparison between present-day America and China during the Cultural Revolution.
My primary disagreement with this comparison is not with that fact that present-day America has a higher reported incarceration rate than China during the Cultural Revolution, it is the fact that to an audience that may not study history, it helps craft the narrative that China during the 1960s was a much nicer place to live than present-day America because the incarceration rate was significantly lower. I thought it was worth mentioning that, regardless of why it happened, or if anyone was at fault, one of the largest famines in human history occurred in China immediately preceding this time period, which made it not a very nice place to live. There are things worse than incarceration, and most people, myself included, would choose life in a U.S. prison over starvation. Not that either choice is a good once.
My secondary disagreement was with the implication that I don't know how basic statistics work. I suggested that a massive removal of poor-people from a population could have reduced the overall incarceration rate. You said that this was "nonsense". Not that there is insufficient data, or that it wouldn't be a very significant change. My burden of proof is not, probable, or possible, it is just above the level of nonsense. Or do you retract your previous statement that I made a nonsensical argument?