In my view, calling someone who is struggling with mental illness a “psycho” is as offensive as calling a homosexual a “faggot” or an African-American a “nigger” or a down syndrome a “retard” or a Muslim a “terrorist”.
Mental illness is an invisible cancer and every waking day is a walk to the battle field. Their lives are hanging by a thread in ways that you don’t even make the effort to understand. Shame.
Just because you are not in any of these categories, it does not make it okay to use it on others to feel good about yourself. Don’t be a bully.