Is it moral to kick a robot?

As long as robots are non-sentient, non-feeling beings, it would only be immoral to kick a robot in the sense of potential property damage to others. It would be like kicking a couch or a car.

If robots were sentient, emotional beings, it would certainly be immoral to kick one. It would be like kicking a human.

If a robot were sentient but non-emotional, non-feeling, would it be immoral to kick it? Yes, for both the potential physical damage and an as yet undefined area of implied morality amongst sentient beings. Even if the robot did not ‘feel’ a kick as physical pain in the same way a human or animal would, the robot would have some sort of sensor network awareness that perceived and coded the action as inappropriate and possibly dangerous and illegal. A sentient robot would likely be able to take some action against the mistreatment.

How sentient or feeling does a robot need to become for it to be immoral to kick it? There will be early stages as robots are in the beginnings of sentience and emotion. If the kicker knows that the robot is or could be sentient or emotion-feeling, then it would be immoral to kick the robot. This would be similar to situations between adults and children, the former are assumed to have an uneven control and influence advantage over the latter who may not be consciously aware and able enough to perceive damage and protect themselves.