How to convince the customer that the site design is good?

Question

Design

Very often there is such a situation when the customer does not like the design of the site and he is sorry to make it differently, but he does not know exactly how.
It happens that it comes to the point that the customer says that since the developers do not understand anything, he will make it himself and will only need to make it up and then sends a layout that is not suitable for layout.
Tell me how to convince the customer that flat sites are normal, they do it now and that he doesn’t need to make the layout himself, because if he knows some kind of graphic editor, it doesn’t mean that he knows how to make layouts.
PS Tell me your persuasion techniques that you use if you simply cannot refuse the order

Answer 1

Due to the low entry threshold into the region, such situations are not uncommon. The customer won't give you a comment on reactive programming because the entry threshold is higher. If I knew the reagent, I would give good advice .
Option two. Convince the customer that his knowledge is imperfect , and if the customer is critical of himself, and your work is really good , then maybe he indirectly admits to his wife at night that it’s possible that he’s probably not right in everything :)
Or to score on the project , to make cool portfolio and wait for the customer, who will ask you to do " this is how it is in your work ".

Answer 2

If your design is not to your liking, then by definition it is bad and should be revisited.

Answer 3

To know not only practice, but also academic methods and approaches in the defense of certain decisions.
It all depends on the task and the object of protection. ( :