Whataboutism is just plain dumb. One country doing bad things in no way justifies any other country doing bad things. Especially when there is broad agreement amongst most people that both things are bad.
This is deeply subjective obviously: It didn't strike me as "whataboutism," but more a refutation of what seemed like a moral-political superiority complex. Devopyl's comment expressed this old-fashioned view; very reminiscent of the 80s and 90s, for me, and I think geogra4's balloon-popping was well in order.
We may have different definitions of "whataboutism" as well :)