How Do We Know Moses Interpreted His Experiences of God Correctly?

Questions about how we know the biblical authors (Moses, etc.) interpreted their subjective experiences of receiving revelation from God correctly as opposed to Mohammed or Joseph Smith and how to respond to the idea that we can have different truths and both be right.

• All supposed revelation of religions involves a subjective experience of receiving that revelation, so how do we know the biblical authors (Moses, the prophets, etc.) were interpreting their experiences correctly as opposed to Mohammed or Joseph Smith?
• How should I respond to a meme claiming that your truth is not my truth and we can both be right?