Anyone is qualified to have an opinion. And anyone is pefectly qualified to defend their opinion to the best of their ability.
To follow your contention to its logical conclusion precludes the ability to pass on knowledge.
Given the facts of what exactly is and is not opinion, your statement makes little sense.Nonsense.
I am an intellectual and a scientist, and I know a lot of things, but there are many areas where I am not at all qualified to have an opinion because I simply am not informed about the issues.
To state otherwise would be unrealistic and childish hubris. Only ignorant people, unaware of their cognitive limits, are able to believe that they are entitled to an opinion on anything.
An opinion is a personal attitude, view, or appraisel.
That does not require any special knowledge.
Of course, knowledge and forthought help a great deal in being able to defend the opinion later, but that is not a requirement for an opinion.