If it gets where the judge thinks it is out of control, she will stop it. Right now, I believe everyone is trying to keep it civil for the jury's benefit. She certainly can tell him to stop, but sometimes it is best to let him go. The jury notices how he is treating those around him. Coupled with the smirking behind him, IMO it does not create a good impression for the defense or the defendant. He is obviously flustered - as is everyone - and I honestly can't blame him. He is fighting a tornado with a toothpick.