Anselm Hüttenbrenner was a composer who studied with Salieri and it has been noted in Antonio Salieri and Viennese Opera and quoting him
Of Mozart, he always spoke with the most extraordinary respect. He, the incomparable one, came often to Salieri with the words: Dear Papa, give me some old scores from the Court Library. I would like to look through them with you. In so doing he often missed his lunch. One day I asked Salieri to show me where Mozart died, whereupon he led me to the Rauhensteingasse and pointed it out. It is marked, if I remember right, with a painting of the Virgin. Salieri visited him on the day before his death, and was one of the few who accompanied the corpse
Source of this quote: Anselm Hüttenbrenner, "Kleiner Beytrag zu Salieri's Biographie," AmZ 27 (1825): cols. 796-99; quoted in Rudolph Angermüller, Antonio Salieri: Sein Leben und seine weltlichen Werke unter besonderer Berücksichtigung seiner „großen“ Opern. 3 vols. Munich, 1971-74; 3:6; English translation in Thayer, Salieri, 177-78.*
Is there a specific reason why Salieri is projected as a character who despised Mozart?