So in my head it associates here, and to you. Then this popped up on Facebook and amused me.
Where it comes from is this Tik Tok.
https://www.tiktok.com/@linzrinzz/video/6714782003637521670
Then Taylor Lorenz in a NYT style column wrote this.
https://www.nytimes.com/2019/10/29/style/ok-boomer.html
And see the change in the google trends data.
https://trends.google.com/trends/explore?date=today%201-m&geo=US&q=%22ok%20boomer%22
Oh yeah it got even more ridiculous when some conservative talk radio show host (who is not that popular for he is not syndicated) compared Ok Boomer to the N Word and saying it is the new N word.
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¯_(ツ)_/¯
Ok Boomer is nonsense for it does not have a fixed meaning without context of when and where you use it. Yet people want to have opinions on it irregardless of context for we live in such a wonderful world right now, and we feel like this wonderful world sure listens to us, and values our opinions.