Kate, the then-Duchess of Cambridge’s sneer at Meghan Markle at the 2018 Royal Foundation Summit, continues to fascinate both royal and Sussex fans six years later thanks to Prince Harry’s book Spare. The summit was a chance for the four millennial royals, which also included Prince William, to lay out the causes for the initiatives they wished to champion in the coming years. The filmed discussion took place three months before Harry and Meghan’s wedding. The forum led to the quartet of thirtysomethings being labeled the “Fab Four” by the British press, which was to be short-lived. According …