I have not been PvPing much since I came back from Brandy, so I do not know if Allos has done anything bad, immoral, whatever you want to call it on freepside.
However, I would not insult him for side switching. Creeps need new players, especially experienced ones and his switching will add some of that.
And anyways, it is just a game. There is never a reason to insult someone, especially if they want to try something new.
Withywindle characters-Caesaran (warden), Dernudan (Lore master)
Brandywine characters- Dernudan (champion), Denthur (guardian), Delphinianic(captain)