“OK, boomer” is offensive, although not nearly as offensive as some other terms. “OK, boomer” is often used to imply that an “older” individual is out of touch with reality. Far from being necessarily true.
As a “boomer,” I was taught to take responsibility for my actions, maximize my self-reliance, avoid “entitlement” issues as much as possible, learn what I can and respect others as much as possible. As a “boomer” who appreciates hard work, who doesn’t believe everything he reads, who doesn’t rely on his mobile phone to “think” for him, I pity those who use “boomer” in a negative light.
Those who mock “boomers” fail to realize the clock ticks for themselves, too, as disrespect for elders will someday fall upon them. Perhaps many post-boomers won’t understand my allusion to a “ticking” clock: Many can’t read a wall clock.