Is it really 'fake' if they're actually using the words appropriately in whatever prose they are creating?
At what point do you address your own hubris when you encounter a word you don't use, or even understand, and rapidly make the conclusion that the writer is pretentious?
Surely the assessment of anothers pretentiousness happens after examining ones own hubris on the subject matter, or perhaps to put it another way - lack of the sophistication observed in others ... ?