Well, you're linguistic, technically, in that you use language. However, you can't be "a linguistic". A linguist would know this. He would also have more dignity in his spelling and grammar. Not out of an effort to sound more snobbish than the next poster, but because he respects his capacity for using his linguistic capabilities to their fullest extent.
I did not see such an association in language use, but then, perhaps I'm blind, deaf, and dumb.