Regrettably, that's the exact opposite of what happens in psychoses - the sufferer firmly believes that their thoughts and behaviours are completely normal. In other words the objective unreality becomes their subjective reality, so they see no reason whatsoever to seek intervention, medical or otherwise. It usually takes a major psychotic episode to have occurred (where the authorities become involved to protect the sufferer's or public's safety) before medical treatment begins. Those outside the psychosis, such as family and friends, and witnessing the weirdness are often desperate for someone to do something but unless the sufferer is deemed "at risk" or "a risk", nothing can be done.