>>111574313That's because 'ok boomer' came of the millennial resignation of trying to discuss anything with boomers. It has a background and story.
Ok millenial sounds like what when you insult your little brother and he just repeat the same insult to you but worse because it doesn't make any sense.
If boomers were clever, they would invent something else with one of the millions things that are wrong or funny with the millennials.