There is not one truth, there are many, all depending upon our perspective. It’s all a matter of perspective, and the sooner we actually start to live our lives based on that understanding, I think the world will change for the better, both for the individual as well as society at large.
So the really mind-blowing idea here is that observer’s in different frames will perceive different version of the same reality. And every observer’s frame is equally valid. So before you start to make any observational arguments with others, first imagine yourself observing through their reference frames.