No, no, no. They have the job, you want it. That email comes across so arrogant that I would expect even the newest hiring manager to laugh and delete. Without even addressing the sour grapes attitude about coding interviews, the sheer arrogance with which you try to dictate someone else's process is a red flag in the first place. That, plus the fact that you're refusing to do what they want, is really bad for your c…
This isn't a one way street. As an employer I want the best possible candidate. I want someone who can think on their feet and is able to say no to unreasonable demands. I want someone that brings his own perspective to the table.
If I want a code monkey - I would advertise for one.
And as an employee I want an employer who values my brain and my problem solving ability in complex and ever changing environments more then arbitrarily idiotic coding tests (or in my case analytics problems removed from anything resembling real world situations).
I am glad to be working at a place that enables me to have both (as a colleague sitting in talks with applicants and being an employee).