Humans and dolphins. None of the "whales" mentioned (orcas and pilot whales) are actually whales, they're both dolphins.
Yet, this comment has nothing to do with that discovery and only "nitpicks" some superficial detail wholey irrelevant to the discussion. It throws everyone off track with something that doesn't matter -- at all.
It's a semantic debate and it detracts from the conversation. It's annoying and it's why "normals" don't like to talk with hackers.
For the record, some people believe dolphins are whales, and some don't:
It's especially what threaded comments are for. See, I can't derail a whole conversation-- I can just lead a small subthread away from the main flow. So, I figured this was an OK comment to post on Hacker News.
However, in common naming, people generally call things in the Delphinidae family "Dolphins" and whales not in that family "Whales." Orcas are an exception to this pattern, they're in the family Delphinidae but are called whales.
Although you will probably just get confusion by speaking of dolphins as a subset of the whale taxon, and not bristling at the thought by a majority of Americans like you would the human/ape relationship.