Not every character is going to accept or trust the Warrior of Light. If anything, fewer should given than the WoL has slaughtered countless people during this travels for as little reasoning as picking up a contract from an NPC that says 'go here, kill X, return for gil and a new sword'. Gridanians are a mixed bag - some are accepting of outsides, others aren't. Cultures don't change overnight (which is why Ishgard is still experiencing growing pains) nor should they - since making everybody get along and fawn over the WoL doesn't make for a compelling or realistic story.