No. If one disagrees they can simply disagree without any obligation to explain it beyond simple taste.
Fact is most people aren't equipped with the tools to articulate themselves to the satisfaction of someone, like yourself, who has a degree in this stuff.
As a person who holds degrees in music, I see the same thing when a person describes why they like or don't like a certain piece of music. I don't expect the layman to tell me he doesn't like how a certain cadence resolves or he doesn't enjoy the combination of timbres a certain composer chooses to use. They just "don't like it" and that is as far as they can go. I may not agree with it but I certainly don't expect them to defend their POV from an academic vantage point in order for their opinion to be valid.