Around 50 people gathered outside the dealership on Kings Road on April 10 chanting “black and white unite” carrying banners saying “stop racism” and “multi-cultural Britain”.
A spokesman for Evans Halshaw said there had been a thorough investigation and they had taken proportionate action.
The regional manager was cleared.
Staff complained over comments allegedly made by the area manager with one incident being witnessed by five people.
The business manager, sales manager and five other salesmen quit as a result of the remarks.
A spokeswoman from Pendragon said: “Evans Halshaw does not condone racism or harassment and takes such allegations very seriously.
“Proper grievance and disciplinary procedures were put in motion by the company.
These were conducted by members of the human resources team and by senior leadership.
After thorough investigation following the disciplinary process, the company has taken proportionate action.”
Citroën declined to comment on the matter.