Well the easiest way to repel those eagerly annoying people (trolls?) is just to plainly lie ... say Nokia's display has more pixels and the battery life is double the iPhone's, say you can download p0rn and that it has a better AppStore but you're too cheap to waste money on it. Don't let them interfere when youre talking and end your speech with, well anyways they're both really good phones but I prefer mine just a little better.

... they cannot respond to this (unless they call your bluff, so remember PokerFace!)