The author likely lives in a state where such a thing happens (both parties use primaries where I live, but the term is not unfamiliar at all).
https://th.usembassy.gov/primaries-caucuses-differences/
You might want to tone down the hyperbolic aggression. It isn't the author's fault for using a word in a fitting analogy just because you're not familiar with it.
Missing that (and thus the question that started this thread) is okay. Your aggression is not.