The number of people shot, to call an incident a "mass shooting," is 4. How odd.
Why not 3 or 2?
Because for all numbers below 4, the majority of shooters is black. Out of 40,000 people shot, there were 409 "mass shootings."
He is noticing a statistically constructed term.
Notice how so many young white men become mass shooters but no one stereotypes their entire race as violent.