Why does Archer hate Shirou?
"Archer and Shirou have a complex relationship in the Fate/stay night series. Archer is a future version of Shirou who has gone through a traumatic and despairing experience, causing him to become disillusioned with his ideals of saving everyone and believing that they can be achieved. As a result, Archer is bitter and resentful towards Shirou, as he sees him as a naive and foolish version of himself who has yet to experience the same pain and loss.
Archer also dislikes Shirou's tendency to put others before himself and his willingness to sacrifice himself for others. In Archer's eyes, this kind of selflessness is not heroic, but rather foolish and futile. He sees Shirou's ideals as unrealistic and misguided, and is frustrated by his determination to pursue them even in the face of impossible odds.
Despite this resentment, Archer also sees something of himself in Shirou, and is conflicted by the similarities between them. He recognizes that, in some ways, Shirou is a better person than he is, and this realization adds to his bitterness and frustration."



