There is no one correct term. Politically correct terms always change based on whom you are talking to and the popular word for that time. It would be more respectful to ask someone what they prefer. The most important thing to remember is to never label someone or judge them based on their abilities. It’s important to put the person first. For example, instead of saying “disabled person”, you could say “person with a disability” or “person with schizophrenia”, instead of “schizophrenic”. Also, keep in mind that terms such as “crazy”, “mental” or “psycho” are disrespectful and only perpetuate stereotypes of mental health issues.