In every context I know of, "naive" is a condescending term when applied to an adult. Do artists in this "genre" appreciate their work being labelled this way? "Unconventional" was right there. It means roughly the same thing, but without the side helping of implied... deficit.

Can an artist who submits their work to this gallery -- which features the word in its very name -- really be called "naive"?

I can't tell that the works are "naive" in any sense -- they look no better or worse to me than other artwork -- and I feel no desire to change that by "educating" myself on how "non-naive" art is supposedly better.