You would do well to steer clear of groups of young males, even if they look relatively benign on approach. I would no longer worry about seeming racist for crossing the street. That’s the sad reality of the City now. For your own safety, you must assume the group’s intentions are poor, and alter your route. If the group follows you, be prepared to defend yourself quickly and violently.
This is not a dangerous neighborhood. These kinds of attacks are happening all over the city in nice areas, and it’s not going to stop until the city either ruthlessly prosecutes the perpetrators, or someone start shooting these hoodlums in self-defense. I don’t give good odds on the former.
UPDATE: Just realized the Fox video is embeddable.