This video is actually really good for S & T. Imagine you walk outside and the neighborhood teens are sitting on your car, riding bikes on your lawn, etc. When dealing with a group of teens things can go south very quickly if you don't approach the situation properly.
This video is an excellent example of how over-reacting simply escalates and exacerbates the situation and puts you at risk. Can you verbally confront teens who are tresspassing- yes, in fact, being a wimp or passive would only encouage them... but he obviously lets emotion get the better of him when he begins the direct insults. Once he makes it personal, the kids have much more incentive to stand their ground and counter insult.
Also, a "I'm calling the cops" might have helped give the kids an "out" here.