Is there, or should there be, a distinction between these two concepts?

Opinions about things that are clearly subjective: what is the best color?

Versus “opinions” that do have factual answers, but the answer is unknown: does the Christian god exist?

I see a distinction between these two concepts, yet people often tend to end debates related to the second type of opinion by saying “well, that’s just my opinion.” This can be frustrating because in many cases, the answer exists and is obtainable, but people indicate that the topic is off-limits by saying that they have a right to their opinion (to be clear, I do believe people have a right to their opinion).

Do you see any distinction between these concepts? Should there be any distinction between these concepts?