He came into contact with her back and rested his chin on her shoulder.
The touching was momentary, the news site reports, but the woman told Naughton that she did not want to be touched.
One of her male friends saw the incident and could see she was uncomfortable.
They exchanged words, WalesOnline reported the prosecutor saying, before Naughton headbutted him to the ground and then got on top of him and punched the victim to the face.
Naughton, who now lives in London, was charged and later pleaded guilty to assault occasioning actual bodily harm and common assault.
The male victim told the court: “I woke up with blurred vision the next day. The experience has been horrifying for me and those closest to me. I have never been involved in an act of violence and I never expected something like this to happen. I felt low for a number of weeks.”
Naughton’s lawyer said the happily-married father-of-two had been “terribly in drink” and was left “mortified” by his action, WalesOnline reports.
Recorder Christopher Felstead called it a “nasty assault” and sentenced Naughton to six months’ imprisonment suspended for 12 months and ordered him to carry out 120 hours unpaid work and to pay NZ$3800 in compensation.
