Some things just can't be explained

Philosophy has the bittersweet capacity to effectively destroy any sense of absolute certainty for those who study it. Anyone with the slightest awareness of life outside his own reality can realize that variations in opinion make abstract concepts (like beauty or morality) subjective, but philosophy takes on even the concrete and the seemingly assured. A lamp or the ground becomes subjective when someone suggests that they only exist in his imagination. As philosophy progresses past the postmodern age, certainty has become synonymous with close-mindedness and backwards thinking; everything depends on perspective.

I'm guessing you, like most people, consider some things to be closed to interpretation, such as religion or personal standards of right and wrong. But the very fact that other people don't agree, that they have their own opinions and interpretations on those same ideas, inherently makes those concepts subjective, whether you think they are or not.

If there were such a thing as absolute truth, it would still be considered subjective thanks to the people who would refuse to believe it.

A better question, then, might be: should everything be subjective? As enlightened as a postmodern, subjective mindset appears to be, when considered in a rhetorical or educational setting, it's a pathetically simple excuse. When any discussion can be definitively, unarguably ended with "well, that's just your opinion," what's the point in debating at all? Subjectivity creates conversation and argumentation through variations in point of view, but it also has the contradicting, dangerous ability to end any dialogue with that glaringly obvious statement.

After being alive for a certain period of time, the omnipresence of subjectivity is impossible to ignore, but being aware of relativism doesn't make opinions or personal interpretation any less valid. For the sake of decent discussion, it is essential that an individual sense of opinion and certainty remain intact despite the acknowledgment of other points of view. Everything is subjective, but life would be awfully boring if arguments ended there.