You are being harsh on the parent. The photo clearly shows the guys doing very unsafe things on American streets. I am actually surprised that police didn't give a ticket. It had made enough news in Indian circles during apri-may 2015 timeframe I don't know why you do not think that photo represents an insinuation and not a truth.
And these guys are not under represented minorities like Blacks or Gays. They come from one of the richest and politically well represented castes.
Translated into American, when good-old-boys (or high caste people) do this at a sportsball game (or wedding) in the US, they're just having a good time. When "those people" do this in what's clearly a parking lot, they should be arrested by the police.
That has no effect on the validity of his argument. Either ethnic pride and celebration is ok or it isn't, unless there's some principle one can stand behind to distinguish between which ethnic groups can legitimately express pride and community and which can't.
And these guys are not under represented minorities like Blacks or Gays. They come from one of the richest and politically well represented castes.