"You might have fun raging on the internet, but I think your goals would be better served if..."
He rightly responds:
"Umm. I think I've been able to reach my goals on the internet better than most people."
I believe in civility and courtesy in many areas, and Linus doesn't phrase things exactly as I would. But then, I don't have his responsibility or experiences, either - and while people can disagree about whether he expresses his thoughts in a polite manner, he certainly does so in a clear one.