Apparently you see it as some sort of whining.
I don’t see Trump as a whiner. I see him as fighting back. He draws attention to the left’s hypocrisy.
First how did Trump hear about the “gang-banger” thing if someone in the leftist-sphere did not voice disapproval and second it seems like a childish attempt to shift the attention away. He’d be better off letting others make such points for him.