"He's perfectly capable of being polite and decent..."
Only because he's such an adroit liar.
He's incapable of basic human decency and has been that way since childhood.
Chatbots that mentioned Trump when queried to describe an anti-Trump meme: Gemini, Meta AI.
Chatbots that refused to mentioned Trump when queried to describe an anti-Trump meme: Microsoft Copilot, ChatGBT, Claude.
He doesn't seem to know where he is. Or where to stand. Or what to look at. Or whom to talk to. He's so lost.
Capable of feigning politeness and decency. Socio/psychopaths learn to mimic such things. But they're incapable of any authentic human decency.
Trump is the proverbial turd in the punch bowl, the folks at the G7 are avoiding him like a crazy old man with a full diaper 😝