This is exactly why you should never use your personal experience as an indicator of what the norm is. Instead you should observe the world — and in it designers design and programmers program, only rarely does one person enjoy both.
And what are you using? I have observed the world and my observations about web designers are completely different.
I have asked before for references or articles supporting your point of view and you have not posted anything. @charlesr posted some excellent links below. Where is the evidence that supports your perspective?