I agree that Apo looks like a clown, and an immature baby, yet he stated that "as a grown man I am insulted", by Rivera saying "you dummy". Apo is VERY sneaky, however, and I wouldn't be surprised if he instigated it with a comment under his breath (but not audible to the video's audio) to prod a response from Rivera.
As to Apo's questions, it appears to me they are more calculated than we're giving him credit for. His outrageous questions regarding sexual pleasure & sexual innuendos, coupled with questions about Charli's financial situation (gas tank running on dry,etc), her sisters living with her & not their mother, etc, have a purpose and direction. Even though he withdraws the questions, you can't unring a bell. What's said is intended to plant a seed in the jury's mind of a negative character of Charli and her family. It's classic character assassination without the individual being there to defend themselves. Lets hope they see through those, and From some of the juror questions I believe that they are. I hope so.
Another theory, that Apo may also be exhibiting behavior that could lead to a mistrial due to "ineffective counsel". Not sure. He's tricky.
And SC smiling/laughing in court, hopefully any juror would ask themselves, would even a non guilty person not take this so lightly, given that the victims were a former girlfriend and your own unborn baby?