Yeah... you don't exactly need to bring in a federal law to fire someone for saying 'Ok Boomer' in most of the US. Disrespectful, insubordinate, a bad fit, etc. there's no real need for bringing in the age discrimination law unless it's a superior doing it consistently.

Also trying to bring this up to a federal discrimination suit feels like peak Boomer to me. The whole counter-backlash to Ok Boomer is really reinforcing the stereotype it's lashing out against. Decades of articles saying every mildly declining industry is being 'killed by Millenials' or 'Millenials are X' and all it takes for Boomers to start playing federal discrimination cards is a two word clap back of 'Ok Boomer' is just chef kiss beautiful.