There is no "purism" anywhere. There is no pure race, culture, song etc. Everything definable has roots elsewhere. It's a silly term that is used as a pejorative by those enamored of pop music in the music biz.

There is room of course for all kinds of music and tastes and those, like myself, who appreciate the cultural depth of traditional folk music (with the caveat that not all of it is necessarily good) can appreciate pop music and other forms on different terms.

I think it's just a matter of donning different set of ears for each respective style of music.
You don't listen to jazz the same way as an informant from the Library on Congress field recordings or to Mozart, or Philip Glass.

I object to the term as stereotypical and knee-jerk.

A true musician can appreciate myriad forms of music on their own terms. You can also
respect and admire some forms of music without actually liking them.

I don't like Berg or Schoenberg but I respect the hell out of their musicianship.