Usually, when the word "truth" is being raped, the focus is on human perception and the limits of human perception to KNOW.
Like the word "reality." It's a real word. You can look it up. But I doubt many places will define it such that a psychotic person is actually physically not entirely bound by the same laws situated in the same world as the rest of us. (seeing as they are, in fact, not) Because my perception of something is different from that of a person of another culture in which connotations of certain words are VERY different for the two of us does not mean that we experience DIFFERENT REALITIES when we have the same experience but do not look at it the same way. It means we had different perceptions. It means we interpretted things differently. Redefining real words we have real meanings for is just ignorant, pointless, misleading, and [thus] stupid. I suppose it's not pointless if one's goal is to jazz something up to try to sound more intelligent, like one has a new perspective, and so garner some attention. But I would contend that such is not an admirable goal to work toward here.
The bottom line is that the psychotic person is not actually omnipotent. I don't care what the limits of human perception are; we all know that, just because a guy is psychotic and thinks he's superman and he's going to run through that brick wall, when he hits it and kills himself, he is objectively dead and did not, in fact, run through that brick wall. Truth has a meaning too. Debate how knowable much or any TRUTH is freely. But to redefine this word is as bad as "reality." The psychotic guy is just as dead here and now in the real world, no matter what pseudo-intellectual BS might want to claim about us not KNOWing anything.
... ass. 
[I wish I could obey forum rules]
