The Baader-Meinhof Phenomenon is when you never noticed something or saw something before, and then you see it everywhere.
For example say you see a chipmunk in an area you never noticed them before, and now you just see chipmunks everywhere.
Happens all the time when I learn new words. Suddenly that word is everywhere and it never occurred to me that I didn’t know its meaning.
I will probably see Baader-Meinhof pop up all over the place in the coming days.
To be fair, I think “nuance” is genuinely being used a lot more lately because there’s so much backlash against the black-and-white discourse that dominated the internet last decade.