Anti-Mike is very resolute on living its life the way it was created. It rejects any offers made to modify its body any further than it has been already, even if it would make its life easier, because it believes it should be respected the way it already lives.
Beyond keeping its body as close to untouched as possible, it sticks to its original purpose with passion - cleaning, cleaning, cleaning. Its happy the way it was created, and it won't let any judgement change the way it feels about itself. To be quite honest, it is something I admire a lot about the little machine.
Just make sure never to call it a "roomba" - it says that such titles are disrespectful to his brand of robovacs. That's a little something I learned from John - presumably, learnt by him first-hand, from a misstep of his own.