He loves stirring up shit. He loves attention. Trolls love that, too. It's the primary reason for trolling. He knows he can gloat over keeping his base, no matter what; the majority of his hardcore fans aren't even hardcore Republicans and think he's like a Rock Star. He also thinks he's a really good comedian. But, he is also totally serious, below, and he's right. He's sarcastically poking fun at his own dedicated base; he knows he's a genius by comparison (and they think he's one, too).