I would say that whether or not someone has gone through a personal experience doesn't matter. The character is made by an author and there for the audience's sake. If the character is actively alienating the audience (unintentionally, could work towards an interesting thematic end if it was intentional), then the character is poorly portrayed and/or written. Personal experience doesn't really come into it, as most people should be able to empathize and/or root for a character even if they have never been in similar circumstances.