How do you refute something like this:

You don’t refute reality / a sound observation!

You merely understand it differently.

In your learned view, the view in this picture is caused by the “curve of the earth” getting in the way of the bottom of the windmills.

In my view, refraction through the standard density gradient (tending to cause light to curve convexly towards the water/ground) is responsible for the effect.

You may be interested in discussing / exploring differing views as well as exchanging your own over on flatearthresearch!