That's the number of complaints AAU tournament director Gary Charles says he received about LeBron James after the NBA superstar went crazy celebrating on the court at Bronny's game.

Of course, the media went WILD over the footage ... with some people saying Bron was acting inappropriately over the weekend and taking the attention away from the kids. Some people suggested any other parent would have been reprimanded.

But, Charles, who runs the Big Time Tournament in Vegas, says the overall sentiment from people at the tourney was ... THEY LOVED IT!!!

"I thought it was awesome," Charles tells TMZ Sports ... "The way he went out there and showed pure joy."

"But what I loved about it was that I was watching a father rooting for his son's team."

By the way, Charles ain't just blowin' smoke -- he's a legend in grassroots basketball and he's worked with a TON of famous players and parents from Kobe Bryant to Lamar Odom, and others.

Charles says he was with LeBron and the family all week -- and was impressed with the way Bron not only showed love for Bronny's team, but ALL of the kids who played in  the tourney.

"I watched that family all week. They were first class every single day. I watched LeBron the way he handled himself, how he was so enthused when these kids were playing."

Charles says LeBron's energy is infectious and he's obviously welcome back to EVERY one of his events.