Just when you thought the trash talk in the Hawks vs. Knicks series couldn't get any better ... here's NYC mayor Bill de Blasio throwing more fuel on the fire, shading the hell out of Trae Young!!
The 60-year-old -- rockin' a NY Knicks ball cap -- took time out of his daily press briefing Tuesday to take shots at the Atlanta star ... and it was aggressive!
The mayor accused Young of crying for calls ... and told him to straight-up stop.
"Stop hunting for fouls, Trae," de Blasio said.