No, he's right. Opinions can't be right or wrong.
They can be stupid, though.
Opinions can be turned into facts if given enough research and actually proven.
o·pin·ion
[uh-pin-yuhn]
noun
1.
a belief or judgment that rests on grounds insufficient to produce complete certainty.
These grounds have the possibility of being sufficient in the future2.
a personal view, attitude, or appraisal.
3.
the formal expression of a professional judgment: to ask for a second medical opinion.
4.
Law . the formal statement by a judge or court of the reasoning and the principles of law used in reaching a decision of a case.
The key word above is 'believed'. An opinion relies on what you believe about something, not whether or not it's true or false. If it relied on being true or false, it would be a fact.
Can we get back to music? We have derailed here quite a bit.
The discussion on music was dying anyways.