Can't prevent books from being synced from iPhone to Mac

Now that we have iCloud I can finally return my iTunes into being just a music jukebox. Apps, books, tv shows don't belong in iTunes in my Mac.

I have been able to clear everything that is not audio from my iTunes. Keeping just music and audiobooks. Except for Books.

Every time my iTunes syncs my iPhone through WiFi with iTunes it brings the purchased books back from the iPhone.

If I uncheck the box to sync books, next time it rechecks it by itself and re-adds those books. Its quite frustrating. Then the books tab in the sidebar re-appers.

I am assuming this is a bug. Anyone else having this issue? I looking forward for what I think will be iTunes 11 redesigned with iCloud in mind.