In the article Morricone was annoyed about Tarantino wanting a film score finished quickly . Morricone presumably doesn’t operate that way & probably used that annoyance to have a pop at Quintin.

Ennio Morricone denies bashing Quentin Tarantino, says interview never happened...
Ennio Morricone denies bashing Quentin Tarantino, says interview never happened