Look, that wasn't a tone problem, it was a content problem.
Whether or not ed was sarcastic or complimentary, nevertheless his comment made people realize that Spolsky could stand to gain financially from the article. Putting that on the radar (even if it was in the form of a compliment) was a hit to Joel (even if he didn't intend the article as PR).
All the smileys in the world wouldn't make that content issue go away.