For some reason I'm also finding the "pro-nice" side more stereotypically feminine.

Definitely. Nice == sugar and spice. Not nice == snips and snails and a fascination with dinosaurs. With repeated emphasis on the word "stereotypically". Most people are a mix. I notice I have become more nice with age - a process which I analyze as becoming less insecure about whether I am perceived as sufficiently macho.

Some additional random comments:

• Comedy can be either nice or not nice. Same goes for tragedy.

• Is this a 5th dimension to add to the 4 Meyers-Briggs dichotomies?

• Would an OkCupid test be an easy way to collect empirical data?

• Would this make an interesting case study to supplement EY's old postings about "rubes" and "bleggs" and naive Bayes classifiers?

The predictive power: people who have "pro-nice" tastes in one arena of life ought to have "pro-nice" tastes in others, and vice versa.

It would be interesting to find out for sure ...