I think thinking you have to prove something to someone is mostly motivated out of ego.

Although I have had people come up to me who had no idea what lucid dreaming was and they told me I came into their dream and told them they were dreaming and they became lucid for the first time. Along with bunch of other confirmed shared dreams with friends. But really I don't want to have to prove anything to anyone. I don't want to have to be anything for anyone. I want to escape that. I want to be pure. I want to fight for my purity.