This is textbook Donald. I've been watching his interviews for a long time, even before he got into politics. Every time someone opposes him or does something he doesn't like, he doesn't explain what they did that was so wrong, he only says they're against me. Then he tries to delegitimize them: they're horrible people, lowest form of life, crooked, bad, cheaters; you name it, he says it. That's why he's always feuding with someone. He's played and manipulated people for years with this tactic and he still is.
Keep watching, it won't be long before he manages to start a feud with John Roberts; though I suspect Roberts has sense enough and the self-control to not take the bait.