True, and her ego was never justified by her achievements on court. As a result, she--as you know--spent years attacking Graf, and then Serena for the "crime" of being undeniably superior to Navratilova.
..but that's not the first time that's been observed about Navratilova.
Overall, her record is not that of the GOAT, and of course that applies to Evert as well. With Court before them and Graf in their then-future, Navarailove and Evert's shortcomings are far too obvious and place them in a category far away from the GOAT, as they have never displayed that concentrated dominance in the calendar year.