And what does that mean? Do you think an opinion is an innocent thing? Do you think your opinion has no ability to influence what others think or do? Opinion has always been and will always be the greatest influence over human belief. No opinion gets stated as something that is true for the speaker only - opinions get stated as facts, as objectively true. So there is no "just my opinion" unless it goes unshared. Once uttered, it claims itself irrefutable.
And what is wrong with making a strong claim such as "photography is not art"? Why hide behind the wishy-washy shield of subjectivity, implying that it's "just" what you believe? If it's to avoid needing to defend your claim, justify your statement, and define your terms, then you should not make the claim to begin with.
Sigh...
