An opinion, by definition, can't be wrong, An opinion is "a personal view, attitude, or appraisal." The only thing right or wrong in an opinion is whether that person truly things "x" or if they don't try think "x."

On the other hand, if you phrase something "X is evil" "X is bad." Then it can be wrong. You're putting out a declarative statement, which can be true or false, wrong or right.

Saying "I think x is evil" is only saying what you think, which, as I said before, can be stupid or unfounded, but the opinion itself can't be wrong; saying an opinion is wrong is akin to saying "No, you don't actually think that."

It's all in the phrasing, to me. That's my two cents, anyway. And that's what I've always learned!