Sometimes we are not given a choice. Most likely everyone will have to face crazy down. Here's hoping some of these real-life solutions will help you when the time comes.
Often times fighting words are said. Insults and accusations commonly occur. Mental illness management is a comprehensive list attuned to the trinity of humanity: Body, Soul, and Spirit.
Professional standards in customer service know the best defense is to know where your fencepost stands. There are numerous adult education courses on how to respond to the escalating boob while standing your ground.
Repeating yourself may turn into you yelling. No one has to accept yelling, bullying, or swearing. Say "no" to demeaning behavior. It is never too late for adult learning in adulting.
If you can leave crazy to itself, let it be. When someone is already over the top, you'll just be cherry on the whipped cream. Please know everyone who is around others is part of mental illness management as "they" are "us".
Mental illness management is adult education. Once ignited, only fuel can make a difference, and that's a total blow-up scenario.
Never let crazy be comfortable with your discomfort. Swallow it once; you'll be gagging for all time. Mental illness management is the responsibility of all parties involved. If your loved one cannot control their Super ID, they will receive little impart from adult education.