In my experience, it’s usually people trying to overexplain “homo sapiens sapiens” and “homo sapiens neanderthalensis” because they don’t know anything about the topic at hand except those words. Subspecies on the character sheet has always been a technicality issue.
I’m a horrible listener, I tune out the first time I have a clarification question that isn’t answered, but I have no shame asking to read the rule book so I can understand it myself. I try to limit lawyering to myself or deliberate cheating.