The genius of the “OK boomer” retort is that any negative reaction to the phrase invites — even demands — the response, “OK boomer”.
The Wikipedia entry for “OK boomer” has a nice overview of the history of the phrase.
This article from The Black Youth Project explains “microappreciations”, a new term to me. This article calls me to publicly back people who are taking a stand and who need to know that someone stands with them. This may be one useful outlet for my various privileges.