I'm on the "He didn't" side of things. I think Patrick Bateman is spineless and powerless (relatively speaking) and manifests a much more powerful aggressive version of himself in his own mind. He's pathetic and his ego won't allow him to acknowledge it.
Along with the evidence in the film that he simply never did the things he did (or did he?) I just find looking at it this way, with this particular psychology far more interesting than the "He's a sociopath and a killer" version some people have in their own minds. There seem to be quite a few scenes intentionally included to clue you in to the fact that it's all in his mind. The blood on the floor while dragging the body (in the suitcase) to the car and then it's gone in the shot where the guy compliments his case. That's no accident, is it?
I have yet to hear a clear and interesting take on why one would think he actually did the things he is shown to have done and more importantly... how does that make for a better film to you?
I understand we can see anything we really want to see in the movie, as it is ambiguous but I'm dumbfounded as to why one would prefer believe "He did it".







