I didn't even understand what that sentence meant > But that day in the classroom, my incomprehensible English taught me that being an linguistic "have" is uns

I didn't even understand what that sentence meant > But that day in the classroom, my incomprehensible English taught me that being an linguistic "have" is unstable and delusional at best. What does it mean to be a linguistic have? Is this a reference to the haves/have-nots. Is she trying to say someone with linguistic fluency? Seems like the "an" is misapplied there too which mucks up the sentence.