We all know that Deidara hates Uchiha Itachi...
The reason is this :
Deidara didnt want to join akatsuki but , Uchiha Itachi said that if Deidara would beat Itachi,they would leave him alone but Itachi defeated him and so Deidara had a huge blow to his ego and carried a grudge against the Sharingan and Itachi for the rest of his life.
The reason is this :
Deidara didnt want to join akatsuki but , Uchiha Itachi said that if Deidara would beat Itachi,they would leave him alone but Itachi defeated him and so Deidara had a huge blow to his ego and carried a grudge against the Sharingan and Itachi for the rest of his life.