Random aside:

Opinions do not deserve respect. Opinions can be wrong. Opinions do not rely on objectivity or *The* Truth (if such a thing exists, which it usually does not outside of physics and adjacent fields). Nobody is obligated to treat an opinion as worthy of much of anything.

It is my opinion, therefore, that people who think opinions can't be wrong are full of shit and are wrong to hold that opinion.

And no, there's no 'agreeing to disagree' when a opinion is wrong.