In fact, if you combined Zach and the equally irritating prick that is the "best friend" from BADIK you'd have the ultimate woman repelling fucktard.
whoa whoa whoa whoa derek is nothing like zach, yes, he's brutish, but he's loyal to his friends to a fault - though I can see how he'd come off worse if a player just saw the first few episodes, he grows on you.
I don't imagine seen from a 3rd person sober perspective either is very attractive from the female perspective, but I HAVE seen guys like derek (beloved by their guy friends as well) do very well in the party game in real life, whereas zach is just obnoxious almost past the point of realism. Derek's are fun at least.
I'm sure there's a female equivalent of him that most guys would turn up their noses and rant about, but she makes for an awesome time when out with girlfriends...