The Athenian Fallacy is a logical fallacy wherein someone takes a positive opinion of something due to one or few highly positive traits, despite those positives being far outweighed by numerous negative traits of a lesser degree. Takes its name from the not-so-democratic democracy of ancient Athens.
Steve: "Wow Athens was a democracy, how great! I mean all the people could vote except women, slaves, freed slaves, foreigners living there, children, men who haven't done military service so like 90% of the population; but still wasn't ancient democracy just so amazing!
Alexios: Dude you're literally committing the Athenian Fallacy!