When to say “I won’t do that”?

In retirement, I do a lot of volunteer work helping nonprofits implement and use Quickbooks. It is often difficult to explain to a "client" why an option is a bad choice. Some options are REALLY bad choices. I am just finishing a project with a client who made two REALLY bad choices against my advice. I am starting to think I should go the "prima donna" route and tell the client I will no longer work with them if they make what is clearly (to me) a REALLY bad choice. I am not sure how else to deal with this. Thoughts?

submitted by /u/JanFromEarth
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