why was it not a gg?

After playing this game:

Me: gg
WrathofKane: it was not you suck i just sent my stuff to attack you... or you lose
Me: thats odd
why was it not a gg?
WrathofKane: cause i dint win
Me: :)
WrathofKane: you can call gg if you lose but it is not unless i win
Me: sweet
WrathofKane: and you saying it after i left means you are a cunt