Bateman is not supposed to be a an empathizable character rather a monster who is internally miserable and vindictive (despite living a high-society lifestyle) and externally artificial, masking himself (literally) because (as he believes) his real, internal self is repugnant and despicable.

The punchline is this is exactly the kind of person that thrives in 80s-era greed-is-good upper management. Our society was made for monsters like him. (And has only gotten worse, as per most of the US Senate.)

Based on the implicit opinions of the author, if you idolize Bateman, you are part of the problem, and you'd find yourself just as miserable as he was when you became your ideal.