Its not necessarily fanboy/girl-ism but the mindset that "My opinion is fact!" about any media. Perspective differs for EVERYONE. Perhaps someone is colorblind and therefore cannot enjoy your favorite color. The only fact there is they cannot see what you see and vice-versa. To denigrate a person for a perspective shows a lack of maturity.
If someone else's opinion is different then your own, have some class and either agree to disagree or at least attempt to enlighten yourself to their point of view. Even if you don't hold the same view, being able to shift your own perspective to someone else's viewpoint can only be beneficial. It doesn't mean you have to agree, just accept that in their universe something you personally dislike is a good thing.
If someone else's opinion is different then your own, have some class and either agree to disagree or at least attempt to enlighten yourself to their point of view. Even if you don't hold the same view, being able to shift your own perspective to someone else's viewpoint can only be beneficial. It doesn't mean you have to agree, just accept that in their universe something you personally dislike is a good thing.