>>151268662
It did not seem like it did as no one believe you can explode a cop car with a single shot from your pistol. He even looked at his gun with disbelief and went along with it. Also the entire freak out scene of him running around downtown with no one in sight by potential victims, and cop cars made it clear it was not reality. The conspiracy that people were covering up his murders for some reason in that apartment that was just happened to be renovated. Yeah, the realtor was worried he was a nut job, and treated him as such.
Bateman's secretary going through his desk looking through his planner where you can progressively see him becoming more unhinged as the months went by. Showing he was going through psychotic nervous breakdown due to the busy aggressive and shallow nature of his lifestyle he keeps up. So I assume Mary Harron made that statement in order to cover the fact that people were not clever enough to figure that out in the movie.