Well, if you ask if all opinions are wrong and I tell you "no," then it would create a logical paradox. So at least some opinions are right.
However, you can ask some people if the Holocaust happened and they will also respond "no," but scientific and historical proof tells us that it, indeed, did happen. And so they would be wrong. So at least some opinions are wrong.
In matters concerning personal preference, opinions can be wrong, too. For example, if someone says "this cheese sucks," but there is someone out there who enjoys the cheese, that cheese obviously doesn't suck. Rather, the first person simply does not enjoy it. As such, stereotyping and generalizations are usually wrong (generalization in this sentence here, too, meaning that it can be disproven in at least one case).
In other words, the only universally true opinions are facts. Math, Science, History. And usually in general statement form. Examples: The Allies won World War II. Ronald Reagan was president of the United States of America. E=Mc^2, F=ma, An integral is a function which accumulates the area below a graph. Other things such as anthropology (while uncovering fact in the process), string theory, and big bang theory make conjecture about certain processes which may or may not exist, and while they may be true, there is not yet proof enough for these conjectures to make them fact.
So I would argue that all opinions outside of fact and generalization are neither right nor wrong. They simply are.
I've been asking around and I've gotten some interesting responses. My question to you all is, "Can opinions be wrong. Why or why not? Please avoid circular reasoning."
Personally, I know that I have some opinions that are wrong. It's simply because opinions are fueled by personal values, which depend on a lot of factors, whether cultural, social, emotional or just what I lived in my life. I consider myself to not hold the universal truth. What I consider right personally, is in fact wrong to many people. When you put it in relations, every opinion can be wrong, because there's someone, somewhere, for who your opinion might be totally against his values, his experiences. Since opinions are not facts, but are seen as the truth for each individual, who are we to claim that our opinion's more worthy than that of others. For my own self, I might think that all my opinions are right, but I have to respect that it might be wrong for another person. And since opinions are relative, I would say that the righteousness of opinions should also be relative.
What Harpalos said. Its important to always realize that your own thoughts are just that, your thoughts and not any absolute truth. They are simply the first steping stone to find such and untill you can say you have found the truth which that stepping stone lead to, it holds no weight what so ever.