The simple answer to this question is if I were to hold your opinion over mine, I would adopt your opinion as mine.
So in a literal sense, if I preferred your opinion, I would accept it as more preferable or logical, and therefore, acknowledge another opinion over mine.
However, contrary to the original point, all opinions are adopted, for decisive action is nothing more than custom and habit.
In summary, most people prefer their own daft opinion because that is what they initially accepted, and if any argument disputed their opinion, acceptance of another’s opinion is fore-fronted inevitably, being then adopted as the individuals own opinion rather than another’s.