I think your question presupposes an objective reality where there are people outside of your awareness who could be gathered together to discuss the nature of reality.
If you had a subjective view of reality you would not ask this question because you would not believe that anything existed apart from what you were experiencing this very moment.
So imagine that you have a subjective view of reality and you go along to a meeting to discuss the nature of reality. From the very beginning, you would believe that you were the only conscious being in the room and that all the others were just characters in your dream.
Some of the people at this meeting would claim that they also had a subjective model of reality, while others would say that you were crazy to believe in something so ridicules. Either way, you would see it all as part of the dream that you were having.
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