Would anyone like to explain what this gemora is saying? Is it saying that there is a limit to the mitzva of rebuke and that is when it causes the chastizer a certain amount of suffering. When that happens he is exempt from having to give further rebuke. Alternatively rebuke has no exemption. As long as it is possible to correct the person he is required to do it. But this gemora is saying that there is no mitzva of rebuke when the person isn't listening. The indication of this state is the point of dispute. Also problematic is the issue of his wife being beaten. The Maharsha says he doesn't understand it.
Erachin(16b): How far shall reproof be administered? Rav said until the person being rebuked beats him. Shmuel said until he is cursed. R’ Yochanon said until he is rebuked.This is a disagreement amongst Tanaim. R’ Eliezer said until he is beaten, R’ Yehoshua said until he is cursed and Ben Azai said until he is rebuked…. How much abuse should a person suffer before he changes his lodging? Rav said until he is beaten. Shmuel said until they throw his bundles over his shoulder. In the case where he himself is beaten, everyone agrees he should leave. Also in the case where they threw his bundles over his shoulder there is no dispute. The dispute is only when his wife is beaten. One view is that this is not a reason to move since he is not personally suffering. The other says he should move because there will inevitably be a quarrel. Why is there hesitation to move when he is suffering? Because when a person moves his reputation suffers and so does that of his former landlord.
However there is a contrary view which says that rebuke must be given no matter what the response is
Tanchuma(Tazria #9): G‑d told the angel Gavriel to go and mark with ink a letter tav on the foreheads of the tzadikim in order that the angels of destruction would not be able to kill them. Gavriel was also told to mark with blood a letter tav on the foreheads of the wicked so the angels of destruction will have the ability to kill them. However the prosecuting angel came to G‑d and asked how were the righteous different than the wicked that they should be saved? G‑d replied that the difference was that the tzadikim were perfectly righteous while the wicked were perfectly wicked. The prosecuting angels said that the tzadikim had the ability to give the wicked rebuke but they did not. G‑d replied He knew that even if the tzadikim had rebuked it would not have been accepted by the wicked. The prosecuting angel answered that while it was clear to G‑d that the protest would not be accepted but it was not obvious to the tzadikim. Therefore the tzadikim should have rebuked the wicked and suffered insults in order to sanctify G‑d Name and to endure beatings as we see from the prophets such as Yermiyahu and Yeshaya.