Sunnis: The Prophet (ص) prohibited us from turning La’n into a habit (let alone a ritual).
Shia: But Allah sends la’nah in the Qur’an though.
Sunnis: No doubt, however, without specifying anybody in particular. Neither He nor his Messenger (ص) have instructed us to innovate entire cursing rituals and prayers as Shi’ism and its clergy have.
Shia: But in your own Sunni reports the Prophet (ص) cursed specific people.
Sunnis: Yes, to every rule there are exceptions, point is he never send la’nah on ANY of his companions (let alone instructing us to perform ritualised cursing marathons).