Seems they don't like Russell in Brooklyn already
"D'Angelo Russell's first appearance at the Barclays Center as a member of the Brooklyn Nets did not go as planned, with fans booing him when he was introduced at Sunday's BIG3 opening event"
I had read comments on Reddit suggesting that it wasn't Nets fans @ the arena. It was just basketball enthusiasts since it was the Big3 event.
D'Angelo Russell on Magic Johnson's parting comments: "I'm just excited to be here...it's the past, so it's irrelevant, honestly."
More professional response than Magic.