Large penises were seen as indiscreet and overly animal. *Satyrs, were always ready for sex and would copulate with anything that moved... The small penis was the mark of a refined and intelligent man, one whose sexual urges didn't overpower him.
..the public life of a Greek man was filled with other men and a few prostitutes.
*Note that satyrs are mythical creatures and not real males.
I dunno, did the ancient Greeks see hung genitals as barbarian? ... would a guy who was hung like a horse and still uncut have been seen as barbarian?
No. IMO the majority of Greeks neither viewed a man's penis size as a measure of his intellect nor that his larger penis indicated that he was a barbarian or a sex fiend. I would consider those who believed such a silly stereotype to be morons.
The more hung persons were in fact thought to be more fertile. The gods of fertility, such as Priapus, were represented by statues with oversized penises. In their temples sexual rites & sex worship were performed.
In fact many modern day museum curators are the ones who saw the ancient Greek's displays of sexuality in art as unsuitable for women & children to see and that is why much of this erotic art is hidden from the public.("gross & vulgar")
Greek pottery often depicted erotic scenes that were either heterosexual or homosexual. In general the erotic art shows that the Greeks celebrated sex & that penis size did not matter. Plato was one exception to the norm as he preached that sex was only for procreation & about nongenital friendships. I doubt that he was invited to many banquets/orgys.
Classical Greek statues can be considered as depicting the androgynous beauty of a youth. This art is about bodily perfection and not geared towards erotism as the previous art was. Thus this art was suited for our modern society but in no means is the full picture of what was on display in the ancient Greek's world.