That's not a recent thing - most of the LLMs I've tried have an annoying tendency to agree with you if you question them, even if they weren't actually wrong. The term for it is "sycophancy", I think there are a few papers that talk about it.
And I think I read in some parenting books too that it is not worth correcting kids over things that don't matter like if they say dinosaurs and mammoth were alive during same time. Over-correcting hurts their confidence.
Maybe LLM been trained on these ideas or maybe it is start of science fiction nightmare and AI really think that it is not worth arguing with mere humans.