Others know a lot more about Kant than I do, but the fact that tried to reconcile an epistemological, subjective approach to truth (e.g. beauty is in the eye of the beholder, for instance, is a subjective definition) with universalistic ideas made him a really hateful figure to Ayn Rand, who herself held subjective ideas of her own, but, she claimed, a subjective approach to truth, in fact, leads to individualistic conclusions, not to universalistic conclusions as Kant had claimed.

Therefore, it's okay to hate on Kant because he is so dumb that he doesn't see that irretutable logic. Oh, wait, I think what she actually says is Kant is intellectually dishonest, which is a short way of saying he is in the pocket of the Church. Blahblah.