Can you help me debate better?

[Alex K]

There is a big problem with that WE.
When you say WE you mean everybody which may not be the case.
How do you know that me or anybody else hasn't grasp that truth?
Why do you speak for everybody when in fact you would not know
what other people think or have got?

You are correct , as I alluded to in my post, you can even go further than that and simply define anything as the truth. If you don't provide a criterion for what is true and what not, or if you even define it such that there is no other criterion other than your word on it, then that's that. The problem is that you will have used the word truth in a sense which I reject, end of story.

Maybe it is indeed misleading that we keep using the word "truth" without saying what we mean by it, and if we leave that implicit, there can be absolute truths dime a dozen.