Raul, Mary Carillo is a native New Yorker and she herself knows that the fans were affectionately giving the kid supportive props by calling out his last name. It is e.g. the EXACT SAME THING with the NY Yankees when current Yankee Luke Voit does something good - you hear what sounds like boooing but what is in fact an elongated "Luuuuuke!" (was the same thing with 'sweet' Louuuu Piniella).We have just examined the end of match video.
The annoying dunderhead announcer Mary Carillo claims the fans are yelling "Ruuuune!". Nonsense. That is NOT what happens at the end of a match. Those are mostly boos against the victorious Djoker.
You can even see the hurt in Djoker's face when he heard the boos.
The booing interpretation is waaaay off the mark.