This may not be attention-seeking behavior at all, at least not a first. You need to determine why he was making these sounds in the first place. The game could be boring to him so he was adding a layer of stimulation to help himself focus. He may not have realized that it’s outside the social norm and just thought it would be fun or funny. Or it could be a way to relieve a little anxiety or stress.
Once people were laughing, that reinforced the behavior. My son loves to make people laugh because he feels like he’s doing something good.
I would have a calm conversation about this incident. Ask him why he was doing it. Explain to him that any talking or noises other than communicating plays to teammates isn’t acceptable on the court during a game. Let him know this is an unspoken rule of basketball.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism