Fine, that’s fair. It’s not explicitly disparaging, it’s just implying that facts older than you, personally, can remember are irrelevant. I don’t know what to call this, but none of the words that come to mind are positive.
Someone on a parallel thread explicitly called the 1980s “ancient”, so whatever.
The only thing I was "disparaging" was your grasp of the standard meaning of phrases such as "very recently, culturally".
You could have avoided the issue entirely by using clearer language like "in the last 40 years."
The idea that I was claiming things older than me are "irrelevant" is nowhere near orbit of anything I wrote.
(Also I don't know if you are American but I am and the median American is around 39.4).
Read the thread again. I think you've misdirected anger at GP (Skeletor guy) towards me and others.
I hope your day looks up.