perhaps he does not like sushi because it gave him a gastrointestinal infection at one point ? or maybe he went on a blind date with an asian at one point and she fell in love while he was not digging it. then, the girl sent her ninja father to murder him because he was so against the idea of marrying an ugly asian. however, he survived and now he is forever against sushi.

hence the reason he hates you, mr. ksushi.