It's the same argument thou - when you refer to a person/group of people you imply a lot about them with the word you use, men/children/kids/elders/americans/whites/ect - guys is no different to a lot of people as its so easily taken as gendered, and if said people don't want to be referred to by guys why not use a different one?

and fwiw the first definition for guys/guy in most dictionaries is "a man".