The point is that if this was racially reversed we would have heard all manner of things about the killer's background and his ties to various unsavory groups, his weird Facebook and other SM postings.
They'd be all over this to condemn both whites and gun owners.
We actually keep track of things like that, so lets inject some numbers in here.
According to the 2018 US Criminal Victimization report from 2018 (The most recent published) There were 563,940 "violent incidents" where the victim was black. Of those in 10.6% of them, the offender was white. So 5977 Blacks victimized by whites. The 2018 total Violent crime rate was 382.9/100,000 and murder was 5.3/100,000 so murder is 1.38% of all violent crime. To make life simple we are going to call that 1.5% and assume that it holds +/- steady across races.
If we do that we can assume that 1.5% of those 5977 victimizations by racist whites were murder. which is [abacus sounds] 89.6. Call it 90 ish. one every 3 or 4 days. The media has the chance to push this narritive that you think they are twice a week. Go ahead and name all 90 black people killed by whites in 2018 from the voluminous news coverage.
Sure, this one is more tragic because the victim is a kid, and it appears to be one of those truly random attacks that hit american's psyches pretty hard because there's no way to reassure yourself you aren't next.
But there's no evidence of a racial bias either in the reporting or racial motive (yet) in the attack. Trying to make one is, ironically, actually doing what you are accusing the news of doing.
If you have evidence beyond vague "I know it would be different if the races were reversed" by all means, share it as I'd like to see it. But I have 90(ish) deaths per year that say the news media doesn't run with, and neighborhoods don't burn, for every incident of white on black murder.