Opinions cannot be wrong. If you think an opinion is wrong what you tend to mean is that an underlying idea that a premise is built on is wrong. Facts can be wrong, opinions cannot.
Take my opinion that the God of the Old Testament is evil*. I think this based on my reading of the Bible (now 8 years ago), plus the passages that conversations about religion and morality highlight to me. With that in mind, the underlying facts include, but are not limited to, this:
In Numbers 31 God commands Moses’ army to take the virgin Midianite girls. This is either war-slavery (which is a slavery as dark as the slavery of America a few generations ago), or it is worse. God also commands the Moses’ army to completely destroy everyone else, not just the combatants; the non-combatants, the children, the women, the cattle, the buildings. Everything. This is the kind of idea that Pol Pot had: to kill a plant you must take it up at the roots.
In Genesis God drowned everyone on the planet that wasn’t Noah and his immediate family. God considered everyone, even the children that were being born and the mothers that were in labour and the children, guilty and worthy of death.
On top of these facts (I could give more, but it isn’t the point of this post) I have certain values. One of my values that is relevant to this discussion is this:
To intentionally cause net suffering is evil.
It is how the facts play off against my values that form my opinions. My facts either are facts, or I am misinformed and they are false statements. The facts are an issue of truth. My values are something you may be persuaded to agree with, but you also may not. However, my values are not issues of truth. My opinions, then, are not truth statements and therefore cannot be right or wrong.
A ‘wrong’ opinion is an opinion formed from false claims masquerading as facts.
*whether a God exists is not an opinion. God really does or really does not exist. If you get out of religious discussions by claiming that ‘it’s my opinion’, do not expect me to take you seriously.