Send over the entire directory for a WordPress site we completely overhauled with new plugins, custom theme, redid content with visual composer, etc. I tell him to backup his site and then put everything I give you as fresh. He tells me he can't just wipe out his entire site that's unacceptable. I ask him what's the problem? he rambles on and says a lot of words that don't really mean anything then says security. so I call him out on it, what security issues do you have? well we have users and permissions setup he says. I explain That I copied his users table over when we did the redesign, so it's the exact same stuff. so I say again, why can't we just replace everything? well that's just not acceptable he says. I ask him again, what EXACTLY is your problem with replacing the site since I already addressed your security concern. he couldn't answer me so now we have another conference call tomorrow morning with more people from their team. I'll let you know how it goes.

tldr; clients are idiots, call them out for the dumb shit they say and have no response.