Reading through the Preface of Phenomenology of Spirit, I came across the following section that answers why, for Hegel, new ideas (or more specifically for PS, the entire project of speculative philosophy) are met with hostility:

Of course, what has been said here does express the Notion, but cannot count for more than an anticipatory assurance. Its truth does not lie in this partly narrative exposition, and is therefore just as little refuted by asserting the contrary, by calling to mind and recounting conventional ideas, as if they were established and familiar truths, or by dishing up something new with the assurance that it comes from the shrine of inner divine intuition. A reception of this kind is usually the first reaction on the part of knowing to something unfamiliar; it resists it in order to save its own freedom and its own insight, its own authority, from the alien authority (for this is the guise in which what is newly encountered first appears), and to get rid of the appearance that something has been learned and of the sort of shame this is supposed to involve. (35)