People who claim to just "not like onions" are a bunch of liars, because there is no way someone could not at least like caramelized onions. In general I think people who have long, long lists of foods that they dislike simply ate some garbage rendition of a food and then never gave it another shot.
Onions and cilantro taste like soap to me. Grilled, raw, boiled, fried, however. Fuck onions, and that's the truth.