This one's ambiguous. It may be referring to "they say" "who's they?", or "them" as the invisible enemy. Maybe "them" is illuminati/reptillians/etc. Or maybe he's rejecting non binary gender, who knows

Might as well try & say you have a definitive interpretation of the lyrics to "It's Them" https://www.youtube.com/watch?v=eyw_IdBlbKs