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Your #1 is the etymological meaning of the word. For precise usage, there should be at least some element of #2, lest you inadvertently misclassify a misanthrope who hates everybody. That’s assuming you’re using a gender-inclusive sense of the word ‘guy’; anyone can be a misogynist.
Party affiliation as listed on voter registration isn’t a loyalty oath either. It’s just a way of asking which primaries you want to vote in. You might as well pick a party with relevant primaries in your area whether you agree with their platform or not.
(Voter registration is public information and may affect which candidates and PACs send you mail.)