To quote myself talking about someone using it as a source in their youtube video:

"Guns Germs and Steel" a notorious pop-history book that has recieved a lot of negative criticism from historians for its inaccurate and infantilising depictions of native American civilisations, amongst other things, painting the conquest of the Americas as an "us or them" style thing, portraying it as "inevitable" and making absurd and insulting claims about native American groups, like the Inca being too stupid to know what an ambush was, because they didn't have horses.