No one is making anything up. No, Trump does not come out and say that he hates Muslims, Blacks, etc. But you are either not paying attention or purposefully remaining ignorant if you believe that Trump does not exploit the racism and hate that a large portion of Americans have.
Maybe I haven't been paying attention. I hear a lot of talk about Trump and supporters being white supremacists, but when I ask his accusers, they aren't able to articulate very significant evidence at all. Most such conversations end with implications that I'm a racist for lacking the astute progressive hearing required to perceive Trump's dog whistles. The irony that dog whistles are (by definition) intended to be perceptible only to actual racists is apparently lost on many progressives.