<ul><li>Nice try is the perfect example. There is a way of saying things in English that communicates sincerity. Nice try can be said sarcastically, as in "Yeah you tried and it was terrible" or as in "You tried, and it didn't work, but at least you gave it your effort." The first one is semi-hostile (even to a friend one can be hostile) and the second is sincere. In both cases nice try does not indicate the attempt was successful.</li><li>Surprise, surprise is almost never said in the context of an actual surprise. But it doesn't have to be hostile. It always seems to have irony.</li><li>Fine does seem inherently hostile to me. "That's fine." is how I would say something is fine without hostility.</li><li>If you are pronouncing "ha ha" as two distinct syllables and not genuinely laughing, it is sarcastic. In text this does not apply.</li><li>"Good luck with that" is absolutely sarcastic. I have never heard someone say "Good luck with that" and mean anything other than "what you are trying to do is impossible."</li></ul>