Furthermore, relativism removes any reason, besides sheer whimsy, for changing one's beliefs. If my belief makes something true, there is no objective warrant to alter my beliefs in the face of argument or evidence. Unlike the correspondence view of truth, which seeks objective support for the truth or falsity of statements, for the relativist, there could be no verification or falsification of any belief apart from introspection as to whether or not one holds the belief. Such an attitude applied to medicine or science is deemed ridiculous. Medical doctors have good reason not to bleed their patients, as was commonly done for centuries.
Scientists have good reason to no longer believe in the spontaneous generation of insects.
Human subjectivity untethered from objective constraints is a shallow and shabby thing. When it reaches a certain stage we call it stupidity or even insanity. But this is the very thing it cannot be. If truth is only a function of individual preferences, one cannot escape the prison of subjectivity in order to make objective statements that supposedly apply to all of reality. A pragmatic view of truth may be implied in some kinds of cognitive relativism.