eh yeah, clearly not a designer.
Anyway, we have all had clients i'm sure, who want X and will not be swayed. But a lot of a designers job, as tomed says is to educate the client as to why X is not a great idea, and Y may suit them better.
You need to backup all your decisions regarding design with facts, and reasons as to why you chose that route, you are meant to be the expert in the field, and should act like that.
If you blindly say 'yes' to everything the client asks for, you are doing them a disservice.