Sutil was given an 18-month suspended sentence and fined 200,000 euros (£167,000) by Munich district court judge Christiane Thiemann after being found guilty of causing grievous bodily harm.
Hamilton had been expected to be summoned as a witness to give evidence on Monday, the first day of the trial.
However, Hamilton's lawyer informed the court last week his client was unavailable due to a prior engagement with McLaren.
"Lewis is a coward," Sutil told German newspaper Bild. "I do not want to be friends with someone like that. He is for me no man.
"Even his father sent me a text message and wished me luck for the process. Lewis came with nothing. He has changed his phone number. I could not reach him any more."
The 29-year-old was found guilty of injuring Eric Lux, chief executive of Lotus team owners Genii Capital, by striking him with a champagne glass and causing a wound in his neck which required 24 stitches at a Shanghai nightclub after last April's Chinese Grand Prix - a race Hamilton won.