The NFL typically does allow for non-judgement call penalties to be challenged. In this particular case I'm not sure it would have made much of a difference except yardage? Even if it wasn't pass interference because the ball had yet to be thrown, the contact definitely rose to the level of illegal contact or holding. Either way its 5 yards and a fresh set of downs. It's a fair question because you can certainly challenge other aspects - like if pass interference is called you can challenge whether the ball was tipped, which negates the pass interference.