Tilting as a Strategy
In no game, EVER, should your main strategy to win be to insult you opponent and make fun of the mistakes he makes. I recently played a game, in normals, on a champion that I don't feel totally comfortable with. My opponent did nothing but badmouth me, ask me repeatedly if I was tilted, and constantly told me how bad I was, and how I shouldn't be playing League. He had mastery on his champ, and I had roughly ten games on the champ I was playing. I'm fine to admit I lost that game, but seeing behavior like that made me lose even more faith in the playerbase of this game.
That's my 2 cents worth.