ACWC > pub games
It isn't about him having low morals, just that he (like most other competitive players) doesn't care about public games at all and doesn't want to jeopardize his place within a competition for the sake of someone else's personal vendetta.
Also, Undead is only doing this because he knows it annoys you. If you want him to ignore you, probably best that you ignore him first - threads like this won't stop anything.
It isn't about him having low morals, just that he (like most other competitive players) doesn't care about public games at all and doesn't want to jeopardize his place within a competition for the sake of someone else's personal vendetta.
Also, Undead is only doing this because he knows it annoys you. If you want him to ignore you, probably best that you ignore him first - threads like this won't stop anything.