I don't think "Ok boomer" is offensive, it just epitomizes how pathetic GenY and GenZ are. "Ok Boomer" isn't an argument, it's just another way of screaming shut up, while covering their ears and making la la la la la noises.
OK, ungrateful eternal infants.
And you should FOAD.
Better if you worried about getting your company's shit in order, because you're clearly neglecting that.
OK fat, ugly hag
Of course leftards and other intellectually-deficient people have latched on to a phrase that has no meaning and have started to use it in place of a logical, coherent argument (which they wouldn't have been able to produce in the first place). And it's females specifically who are the loudest and proudest with their arrogance and stupidity.