Lots of NBA legends (yes, and non-legends) were trash-talkers. There's nothing necessarily wrong with it. Sports are mental as well as physical. Here's the San Francisco Chronicle blog reporting on a Golden State Warriors who can yap effectively:

For the second time in a two-week span, Warriors head coach Steve Kerr compared power forward Draymond Green to a Hall of Fame player. After saying Green’s defensive abilities rivaled those of Dennis Rodman last week, Kerr said Green’s trash-talking abilities are similar to those of Reggie Miller.

Miller was most famous for his feud with New York Knicks’ superfan Spike Lee, but the former Indiana shooting guard would squabble with just about anyone. Kerr found that out, time and again.

Kerr and Miller played against each other at Southern California high schools, again when Kerr went to Arizona and Miller went to UCLA and finally when Kerr played for the Chicago Bulls and Miller starred for the Indiana Pacers.

“Reggie would not shut up,” Kerr said. “I always thought the same thing: ‘Man, that guy is so obnoxious.’ Of course, I worked with Reggie at TNT and found that he’s the greatest guy and one of my really good friends.