I would be pretty salty in your position too, I know the feel. Dying in combat is pretty much the end goal of this game, even if you get shrekt its like "ok fine, i did pvp and lost, time to move on" but that seems to never happen, it's always some kind of bug, backstab or other lame shit.
Sure its petty and low to do this type of thing, especially in retaliation for an embarassing defeat but who actually cares about ethics in an online game? Really the only thing to blame is the game itself, because this type of thing happens way more often than it should. At some point it starts to make you feel like you are wasting your time, grinding for hours on end only to lose it all without a moments notice to some laughably dumb thing like drowning while sailing a boat or some shit.