What am I talking about?
Throughout the books humans and droids are the only species that are consistently seen without capitalization of the species name (unless it begins a sentence). We have Bothans, Duros, Neimodians, Hutts, Wookiees, and Rodians, but then we have humans and droids rather than Humans and Droids. While I could see a an in-universe reason that droids are not considered a proper species name, I can't see any good reason not to use "Human" in-universe if every other species name is so capitalized.
OK, near-pointless rant is now over.