Maybe a sexist slur?
Does a male version of the "Karen" nickname even exist?
An Eric or Kevin. That sounds like a name of someone who is always causing problems and ordering seasonal coffee drinks that are basically boiled sugar water that have no macronutiritional value and yet have the price and caloric content of meals.
There's a Kyle, who is reckless heathen.
None of what you said suggets "White person who is clueless about racial questions", though.
Not really a perfect pair for a "Karen," but there IS calling guys a "Chad."