Why Kaiser Wilhelm DESPISED His Uncle Edward VII So Much?

In 1907, the German Emperor, a man who commanded one of the biggest armies on Earth, reportedly said something pretty wild, and frankly pretty unhinged, about the King of England. He called him a Satan. And then, as if that wasn't enough, he added that you simply would not believe what a Satan the guy was. That would be weird enough on its own. But the King of England was Edward VII, and Edward VII was the Kaiser's uncle, his mom's little brother, the dude who had known him since he was a baby in a frilly christening gown. That same year, the same Kaiser who called his uncle the Prince of Darkness also shipped him two wicker chairs and a set of decorative vases for the terrace at Sandringham. You heard that right. Satan got patio furniture. So what on earth was going on between these two?