A Perth man has been found guilty of assaulting a Muslim woman after a confrontation at a shopping centre in which he wished her a merry Christmas, called her a "f****** Muslim c***" and threw a beer bottle at her.

Adam David Peters was drinking beer while with his children outside a shopping centre in Beeliar last December when 34-year-old Huyla Kandemir walked by.

He told her "merry Christmas" and she replied "no, happy holidays" and he yelled the obscene description at her.

The Fremantle Magistrates Court was told Ms Kandemir then swung her shopping bag at him and he responded by throwing a beer bottle at her and threatening to kill her.

Peters denied yelling the obscenity and assaulting Ms Kandemir by claiming his actions were justified and reasonable because he had been provoked.

However, Magistrate Peter Malone found him guilty, describing his behaviour as "disgraceful".

While Mr Malone said Ms Kandemir had been a "terrible witness" at the trial because she had shown "some arrogance" and "adopted a very combative approach", he found that her evidence about the beer bottle was credible.

During the trial, under cross-examination from Peters' lawyer, Ms Kandemir lashed out calling him "bogan white trash" and calling what he did a race hate crime.

Huyla Kandemir told the court Peters was "bogan white trash". ( ABC News: Joanna Menagh )

However, Magistrate Malone said Peters had started the confrontation by swearing at Ms Kandemir at a time when she presented no immediate threat to him.

Peters was fined $2,400 and made no comment as he left court.

The court heard that after she was abused, Ms Kandemir pulled off her head scarf and yelled "do you want to see my hair? Do you want to see my butt?"

Outside court, Ms Kandemir said she believed she was targeted because she was Muslim and she had to stand up for herself.

"I don't like what he said to me, it was disrespectful about my faith about being Muslim," she said.

"Why attack me for being a Muslim? What have I done to you? I was shopping, walking to my car. What did I do to you to deserve that ?"

Ms Kandemir said she believed Peters "got what he deserved" and she was happy the truth had come out.