A child of eleven can understand it. It goes like this:
There is no truth outside what people decide is true. People vie against each other in argument, and the consenus that emerges is what we call the truth.
If you yourself are involved in the debate, then it is accepted you will appeal to “the truth” in order to convince your opponent. It’s human nature. If you manage to convince enough people, then you will feel vindicated. You can’t help it; you’re human.
Go ahead, support whatever view takes your fancy: it’s a free world.