generationalize 

To generalize against a generation.

Don't generationalize, not all millennials are entitled, spoiled children.

generationalize by canhavoc March 15, 2018

generationalist 

Someone who discriminated against others based on what generation they were born to.

Colin was often quick to dismiss certain Millennial trends or inventions, as he was a generationalist.

generationalist by Inbreakingisnotaword March 13, 2021