Fine, I'm going to spell it out just for you since that's what you're asking for.
In the youtube video in the OP, at the 0:08 mark to the 0:10 mark, Kevin Garnett clearly is wagging his finger at Jose Calderon as Calderon dribbles up the court.
On January 12, 2007, Dikembe Mutombo was assessed a technical foul for finger wagging. The technical foul was rescinded because, according to NBA Spokesman Tim Frank, the technical foul is assessed when someone wags their finger at another player.
Source:
http://www.chron.com/disp/story.mpl/sports/bk/bkn/4468251.html
This is the rule that has been enforced in the past.
Richard Jefferson was assesed a technical for finger wagging at Mutombo on March 10th. Mutumbo has been called for it numerous times, one example being
here.
There is your specific example. You can continue your semantic argument over the anatomy of what KG exactly was doing if you choose, but I think the point is sufficiently made.
The bigger, more important issue is the whole taunting situation. Why is Tim Duncan ejected for laughing on the bench for supposedly taunting, but KG can yell, scream, and pound his chest all over the court? Why is it that Tyrus Thomas
gets a warning for taunting for something similar to what KG does?
KG is frequently given a free pass from the taunting rule because of his "reputation" for intensity.