"Boomer" was something that came out as retaliation of the trend of blaming millennial for everything over really dumb and stupid reasoning (which is still an ongoing trend). The word now is used in certain contexts to describe somebody of that generation who fit certain stereotypes. I have yet to see it belittle somebody /because/ they're a baby boomer, just, when a baby boomer is fulfilling the stereotype associated with it.
But knowing how the human race can be, it'd not surprise me if somebody has.
And you'd be surprised by what comes out of older people's mouths. It's not just young people who can make fun of or be disrespectful of others.
