Well when someone says they know where they fall on the Kinsey scale and even give a number, you can’t blame others for thinking that such knowledge requires a measurement… a test. If you never took a test, then all you did was say what you hope your score would be.
I’m a hard zero on the Kinsey scale, the world could be a 24/7 Pride parade-like a 1980s Greenwich Village Pride parade-and it still wouldn’t create any doubts about my sexuality.