No, see, this the exact opposite of what the leader of this is saying:
Voting for a politician does not entail 100% supporting everything they say, it just means that you support more of their policies than the opponent's. Whether that is justified is another topic altogether and has been and will be debated for decades. This person is actively fighting at least one portion of the politician's platform that he voted for because he believes it is wrong. That is right to me, and I don't feel comfortable with widespread condemnation of that approach.