Folks, there is a method to the madness as to what's is going on in the Twitter world, especially when it comes to these so called, childish tweets about Arnold.
Like it or not ( and the ethics of the issue aside), Trump is still the show’s executive producer, every time he mentions Arnold and the show, he stokes curiosity and people will likely tune in to see what’s going on.
This tweets will hike the interest in the Apprentice and the audience should grow. It is free advertisement.
My conclusion is --- This Twitter “feud” (Note the quotes) will continue. Arnold himself is playing along. Never underestimate the power of PR.