Down down, IQ is down

After seventy-odd (and seventy odd) years of life I keep thinking I have seen and heard  all the worst of human stupidity. But then I read something said by a woman in a red cap, or a crackpot fundamentalist (of any religion), or a loopy flat earther, or a mad-brained creationist, or a Dunning-Kruger climate change denier, or a lobster-potted Peterson follower, or an addled anti-vaxxer, and I realise there is absolutely no depth to which human stupidity cannot sink.