📌 1) Public gaffes and confusion

• At the World Economic Forum in Davos (January 2026), Trump repeatedly mixed up Greenland and Iceland during a speech about strategic foreign policy — something commentators seized on as a factual error and indicative of sloppy preparation.
• His broader remarks there, including recalling exaggerated anecdotes about world leaders, were cast by some outlets as provocative and attention-grabbing rather than substantive.

📌 2) Aggressive rhetoric toward groups and nations

• Trump drew significant criticism for comments about Somali migrants at Davos, which opponents said echoed earlier disparaging attacks on certain immigrant communities — leading to accusations of inflammatory language unbecoming of a world forum speaker.

📌 3) Strange and intense diplomatic actions

• Trump’s threat to impose broad tariffs on European countries over Greenland — then walking back that threat — was widely covered as a dramatic and somewhat erratic policy episode.

📰 4) Cultural/political commentary mocking his behaviour

Several public figures and commentators used mockery and satire to highlight what they saw as childish conduct:

• An entertainer (Jack White) mocked a rambling anniversary press conference using exaggerated, child-like phrasing.
• A commentary piece described a series of controversial actions and arguably over-the-top narratives as indicative of chaotic leadership.

🧠 5) Commentary tied to communication style and coherence

While not strictly “behaviour”, a number of reports and commentators have drawn attention to aspects of Trump’s speaking style and cognitive framing, such as:

• Patterns of rambling speeches, adding more negative language and errors, which some analysts link to being less disciplined over time.
• Fact checks noting instances where Trump misstated or misinterpreted data publicly.

📌 Context & How People Frame It

Terms like “childish behaviour” are inherently opinionated — many come from critics, commentators, or satirists. What’s verifiable are the actions, statements, and documented gaffes. Critics argue that:

• Repeated factual errors and public mix-ups look less polished than expected of a head of state.
• Use of mocking or aggressive language toward critics or foreign leaders fuels perceptions of immaturity.
• Provocative gestures (e.g., tariff threats then walkbacks) get framed as impulsive rather than strategic.

Supporters of Trump might characterise the same actions as assertive, unconventional leadership — arguing that bold rhetoric or headline-grabbing language is part of his political style.

📌 Bottom Line

Over the past year, there have been several high-profile incidents, speeches, and statements that opponents and commentators have characterised as childish or unpresidential — especially in public forums like Davos and in his communication style. These characterisations are part of broader political debate and media coverage about his conduct and leadership style.