The Dutch invented the things.

And show him what happens if you don't 'believe' in those.

The knuckles, with the other hand on top holding them down.

Trump waged a multi-year legal battle to prevent the construction of an offshore wind farm near his golf course in Aberdeenshire, Scotland. He not only failed to have it removed, but had to pay the Scottish government's legal costs.

"The European Offshore Wind Deployment Centre (EOWDC), also known as the Aberdeen Bay Wind Farm, consists of 11 turbines located about 2 miles off the coast of Aberdeenshire. The wind farm generates enough electricity to power a significant portion of Aberdeen's domestic demand."

"Trump argued that the wind farm, which was approved in 2013, would spoil the view from his golf course at Menie and negatively impact tourism in the area. He launched a lawsuit against the Scottish government in 2013 to stop the project. He also reportedly made a range of unsubstantiated claims about wind power, such as that it causes cancer, kills birds, and interferes with television signals."

"Trump's legal challenges were unsuccessful, with the UK Supreme Court ultimately rejecting his arguments in 2015. In 2019, his company was ordered to pay the Scottish government's legal costs incurred during the lengthy legal proceedings. The wind farm was completed and began generating electricity in 2018, according to the BBC. Despite his defeat in the courts, Trump has continued to voice his opposition to wind energy."

Trump just can't let it go.

was he scared by one as a child, the way some of us were by clowns?

Windmills use the wind to power machinery that grinds grain (hence the word mill), and in some cases power other processes mechanically, like pumping water on US farms. Wind turbines, which is what Trump is griping about, are wind-powered generators that produce electricity. I know, picky picky, and I doubt Trump's tiny mind would be changed if he understood or cared about the difference.