Opinions are not facts, but thoughts based on facts. So Opinions are never WRONG. They might be misinformed, strange, or racist in some way... but they can't really be called "WRONG".
Some examples:
Scenario #1: A guy holds some hottie hostage on top of a roof downtown. I could say that I think they guy is a total prick for doing so and that's just an opinion and not a fact. Therefore, it's not wrong. For all I know, the guy snapped and he's nice normally. For all I know, she started it because she's a *****. I don't have all the information, but from what I can see on the ground below, he comes off as a prick and she has nice tits.
Scenario #2: A new Sonic games comes out featuring gameplay modes for Sonic, Tails, and Knuckles respectively as they fight Robotnik (and some other force) to save the world. I could buy it and say "this is fun and I love this game". Another opinion. Even if everyone else in the world calls it shit, if I enjoy it, who are you to argue?
Scenario #3: Someone posts a bunch of examples on opinions online because he's bored out of his mind. One could call him a loser who should get a life. But that too is only an opinion. Maybe he's being forced to do stupid things on the computer for his technologically challenged family. Maybe he's waiting until his girlfriend arrives home from her trip out of the country... or Maybe he's just counting down the days until he finally snaps and rips out the jugular of that annoying prick at work...
... hopefully this helped answer your question a bit.
