You're a little disingenuous with this. You actually said:
The term "boomers" is well known as referring to the baby boomer generation in a derogatory fashion. The content of your post supports this further.
Boomers is literally the short version of baby boomers. You may be thinking of when "OK boomer" is used as a dismissive response to an actual point being made.
I dunno. I think the "ok boomer" meme is perhaps what you're thinking of, being a catch-all term for outdated worked-out-ok-for-me thinking.
'boomer' itself isnt really a derogatory term. No more than 'millenial' as applied to all young people, rather than the correct age group (who are all aged at least 26)
This.



every generation from time immemorial thinks the next generation are the laziest, most work shy, downfall of society generation ever. You can even find writings from Ancient Greece complaining about it 