I got to the racist chapter, and that was a it for me.
Why bother trying to decode the author's intentions? Maybe he didn't mean it and was trying to say something about his characters? I tried to convince myself of that for the first few pages, but by the end of the chapter telling myself that would be nothing but wilful blindness. Maybe it was more acceptable back then - I almost always get a 'standards of the day' lecture when I write something like this - but does that mean we should shrug it off? Five years later Hitler was a quite popular writer and normal by the standards of the day.
Trash is trash, no matter how much you analyse it or pretend that seeing it through ten layers of witty detachment makes it any better.