Speaking as an interminably slow player, I think I must attribute a lot my wins to the game ending with me on 2*30, and my opponent on 12:53 remaining.
I also agree with Bantari (!); their time is their time, your time is your time.
People who heckle you while playing, though, (about your time usage, or anything) aren't trying to inform you of etiquette or help you, they're trying to win (or venting).
Now to round out with a double standard: I get very annoyed when I'm playing a handicap game with someone and they've used a LOT less time than me, especially if I begin winning.
// On the topic of emotions and go, I find that if I get bad news during a game, I have definitely lost that game (and the point at which it happens is quite evident).
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Revisiting Go - Study Journal
My Programming Blog - About the evolution of my go bot.