I don't agree with this, it doesn't seem to describe me or many of the people I know.

Examples: I like melodic piano and instrumental music but I prefer it to be quite minimalistic - I feel like by your criteria that's +1 niceness for pretty melodies but -1 for starkness. Similarly I like a lot of heavy metal but I often like it more when it's played using an orchestra/piano/guitar. So, +1 for pretty instruments, -1 for depressing subjects and often jarring repetitious sounds. I am drawn to the challenging/problematic/etc but I usually desperately want to find a solution to them that will be clean and elegant and beautiful. I absolutely can't watch depressing movies, but I find typical happy endings to be saccharine. And so on.

I think I would classify myself as being more anti- than pro-nice, but the only pro-nice types I would definitely not get along with would be the naive idealistic types who completely refuse to engage with anti-nice concerns.