The mother of a 13-year-old boy involved in a sickening gang attack in Perth’s CBD says she is proud of her son for not taking “crap”.

Michelle says the victim, who was outnumbered, repeatedly punched and knocked to the ground unconscious, had the brutal punch coming.

“I’ve always taught my son not to take crap from anybody,” she said.

“What did he think was going to happen?”

Camera Icon Footage of the fight has been viewed more than half a million times online. Credit: 7 News

Michelle said she stands by her earlier comment that “if you talk s***, you get hit”, claiming the 30-year-old man started the fight.

“If he’s going to say racial things like that, someone will retaliate,” she said.

The sickening attack has been watched more than half a million times online after the vision was uploaded by one of the attackers.

Michelle says her son, who is in Year 8, is remorseful and has received death threats on social media.

The teenagers have not been charged over the attack.

Police say until the victim comes forward, their powers in the matter are limited.