Not exactly a whole new thing. This game, and plenty of other stupidity, was already around when I was a kid, let's see, like 40 years ago... Oh, and it wasn't "black males" doing it (we didn't have a lot of those in Hamburg, Germany, back then ), just youthful members of the master race out for a good time.
These days, gangs of kids in Germany (incl. Germans and others with an "immigrant background) are literally terrorizing the public transport systems in major cities at night, getting all liquored up and then going on the prowl to kick some serious ass.
The attacks can be completely unprovoked, or for some minor "diss" like "Uh, could you please put out your cigarette..." Over the last 12 months, three people have died in attacks of this nature, with a few others beat into a coma, and I'm sure a huge number of unreported incidents and injuries.
I mention Germany because it's interesting to me that we're seeing similar developments in youth violence in two different countries - but like Germany, all the US states that are mentioned have very stringent gun control (as far as I'm aware). Could there be a correlation here, as in less guns in the citizenry = more impunity ???