If it was actually a good game, win or lose - if it was well fought, I just chat "thanks for the game - It was fun". Not sure how that could be misinterpreted. If there was a big blunder on my opponent's part - just don't chat anything - he/she knows what happened.
Amazingly, many players will take offense to such a statement.
I feel offended already.
I'm on the fence on this one.
I don't see a problem saying it if you lost, but saying you "had fun" after winning seems a bit on the asshat side. People usually don't want to hear you had fun beating them.
I lost against a guy from Iran or Iraq recently and he came up with some BS comments. I replied "Have you been smoking goat dung again ?" He did not respond. Maybe he did smoke goat dung and wondered how I knew.
You would think a bag of dung would be the worst thing to send someone, but smoking that dung would be somewhat worse.