o·pin·ion (ə-pĭn′yən)
n.
1. A belief or conclusion held with confidence but not substantiated by positive knowledge or proof: “The world is not run by thought, nor by imagination, but by opinion”(Elizabeth Drew).
2. A judgment based on special knowledge and given by an expert: a medical opinion.
3. A judgment or estimation of the merit of a person or thing: has a low opinion of braggarts.
4. The prevailing view: public opinion.
5. Law A formal statement by a court or other adjudicative body of the legal reasons and principles for the conclusions of the court.

A belief or conclusion held with confidence but not substantiated by positive knowledge or proof.

So, if I have an opinion on what it takes to be a man versus, say, a milksop panty-waist male, then it can be held without substantiation or proof. It is only an opinion, not presented as fact, no one else has to agree with it. Then why oh why do some people require the qualifier that it can be proven wrong, and if proven wrong it must be changed, even if it is only your opinion. How can you prove an opinion of this nature wrong? The example presented is merely my opinion of how things should be, not an edict.

Not only does the above need be, also, if the challenger, has a different opinion he thinks you must adopt his opinion and forfeit your own. Who the heck made him or her dictator?

From now on if I say I have an opinion, then it stands… without qualifiers!