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Although this passage describes, in the first instance, the attitude of the pagan Quraysh towards the Prophet, it touches upon the reluctance of most people, at all times, to recognize "a man from their own midst" - i.e., a human being like themselves - as God-inspired. (See note [2] on 50:2 .)
The pagans demanded an angel to deliver the message, not a human being like themselves.
Their wonder is only stimulated. They are full of envy and spite against one of themselves who has been chosen by Allah to be His Messenger, and they vent their spite by making all sorts of false accusations. The man who was pre-eminent for truth and conscientious consideration, they call "a sorcerer and a liar"!