Uhh, then you shouldn't be a designer...

Lmao who are you to tell me what I can or cannot do. Please argue your case for form over function or leave the room.

edit: The question your raising in this thread and your complaint against this client IMO is trivial. Anyone who calls himself an expert in design can create any look for the client that they want. It really shouldn't bother you so much that your client doesn't want flat design.