1. There is a guy fucking filming him. He's clearly been up and down the street multiple times.
2. He's accelerating on a residential street way more than what is necessary.
3. Guess what, nice communities, ones built recently often have four lane roads on the main roads. Those are the roads, and walkways you use to access the parks, community pools, walk your dogs, etc...
Do you have kids? Do you have any idea how frustrating it is when people zip through or fuck around on your neighborhood streets at speeds that are just completely unnecessary. There is absolutely no reason for this guy to be accelerating in this manner. We also don't know what his previous trips around have been like.
Guy throwing the rock is a fucking idiot of course.
Guy in the Lambo is more than likely an idiot but not enough information is really known.