French star Nasri, 25, was suspended for the Emirates game, which City won 2-0, and not with the rest of the squad on the team bus.
The Sun says mobile phone clips posted on the internet show the ex-Gunners star being manhandled and pelted with insults.
Nasri — who quit the Londoners for Manchester City in a £24million move 18 months ago — was called a “traitor”, “c***”, “w*****” and “p****” as he walked to Sunday’s clash with former team-mate Marouane Chamakh, who is on loan at West Ham.
One fan is alleged to have grabbed Nasri round the collar before Chamakh intervened.
Arsenal fan Robert Richman tweeted: “Some kids started abusing Nasri, calling him a traitor c***.
“Then from nowhere some old boy squares up to Nasri.
“He had Nasri by the collar and he had to be separated by Chamakh.
“Was craziest thing I’ve seen at AFC. Was strange of Nasri to walk through the crowds, but he didn’t deserve such treatment.
“At first when everyone was abusing him he just grinned. He looked very smug. When it turned uglier he became more serious.”