The thing that’s always stood out to me about Donald Trump, besides his cruelty and utter incompetence, is that he’s just so sad and hostile. He comes across as a man who has never experienced a legitimately cheerful moment, aside from the schadenfreude he appears to derive from the misery he inflicts on others.Take his behavior at the G7 summit this week. He secreted the vibe of a man hellbent on taking revenge against those around him, and all…