Alleged Victim's Wife -- Justin Bieber's a 'Punk'

The wife of the man who Justin Bieber allegedly spit on tells TMZ, Bieber is a "punk."

TMZ broke the story ... auto mogul Jeff Schwartz -- Justin's neighbor -- went over to confront the singer about driving in the gated community at speeds approaching 100 mph, and Justin responded by allegedly spitting in his face and threatening to kill him.

Schwartz's wife, Suzie, tells TMZ, "He's a punk. He thinks he's invincible. He can't continue to have a bunch of enablers around him." FYI, there are reports Jeff said this, but it was Suzie.

Suzie also tells TMZ, "Spitting on someone is unacceptable. He can't do this to people."

And she tells us Justin has NOT apologized to her hubby.