I had a look at the site but can't find the article - I must be thick.
Anyway, I can see a few issues. As Susy said, what if you like many genres but not necessarily everything from any particular genre? What if your tastes have changed over the years? Is that a fundamental change of personality or just maturing and being exposed to different types of music? What if your too old to have ever 'got' rap? What if you can appreciate some metal but find the energy too confronting at your age? What if you once heard a good C&W song?
It looks like there are so many variables one wonders how they could tease out any meaning.
And, of course the big one. What if you luv, luv, luv jazz and it isn't even mentioned???

(Ditto for prog, ambient, world and unclassified)