Last I checked, you can't have a wrong opinion. We can have differing opinions, but neither of ours is wrong.
Opinion-
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.
Last I checked, it never said opinions can be wrong according to the dictionary...
You didn't try to help him, you belittled him for questioning Spyderco's customer service. He's entitled to an opinion, but let me guess, his opinion is wrong according to you.