The Shulchan Aruch talks about not answering Amen to a Shaliach Tzibbur who is not “merutzeh l’kahal.” Can an individual who was exploited by said Shaliach Tzibbur and embarrassed by him publicly also not answer Amern as he is not “merutzeh” to him?
The Shulchan Aruch (581-1) is referring to a chazzan that is davening on the Yomim Noraim unless he is “merutza lkahal”, but if the tzibbur doesn’t want him and he pushes his way into davening ,then the tzibur shouldn’t answer. The reason is because he doesn’t belong representing the kahal. See Magen Avrohom O:CH 53-20, that the S:A says ( O:CH 53-19) that even an individual can protest to a person being the chazzan, however this doesn’t really apply nowadays, because the chazzan isn’t really being motzei us with the davening. Therefore it would depend on most of the people of the shul that pay dues. Therefore nowadays if it is only a single of even a few people that don’t like the chazzan. They should still answer amen. It is a correct thing for the chazzan to try to make peace with everyone in the shul.