I hate getting a "Good game" after I've hung my Queen and resigned.

Good for you.

yeah, but maybe right up till that point it was a good game, and that might be what your opponent meant. 

Understood. I will now say good game after all wins.

No warries , i give my Q over 66 times....

I sacrifice my queen in every game to make it more interesting it seems.

;)

gg: Just a formality, maybe.

Yeah

maybe he was telling you that he was enjoying the game a lot up til your blunder and it was sad that it pretty much meant game over.

Ever the optimist...

Maybe.

But surely preferable to presume the best of chess players?

The vast majority I've played over the years are polite and friendly and interested in chess.

If it was Counterstrike, then sure, I'd be extrapolating an entirely different interpretation. 

However, of course I accept the internet is what it is.