> the opinions are not "equal but opposite"

What does this even mean?

It means that this is not an equivalent, right-leaning opinion.

And who gets to judge that it isn't equivalent? Equivalency implies measurability and this seems like an immeasurable assertion based solely on personal opinion.

No one; I was under the impression that this was an opinion stated by the poster. The response just seemed to not understand what the poster was saying.

Oh, got it. You highlighted that part from the OP so I assumed that there was some shared understanding of objectivity here that wasn't apparent to me. If it is just the OP's opinion/perception of equivalency (or lack thereof) and nothing else then I guess there's nothing worth discussing here since the person the OP would be in dialogue with could disagree about the OP's judgement of equivalency and it's just two people agreeing to disagree and nothing more.