As a rule if the husband is popular his friend and the community will side with him. Just look at Clinton everyone knows what he did to those women . Does anyone shun the Clintons ? Even if he is not popular most of his friends wouldn’t shun him and depending on the strength of the sisterhood and whether the shul is affiliated with the Bais Din will determine if he is shunned.
If the goal is to get the husband to leave you will achieve your goal by slighting him, although he may find a different shul.If your goal is to get him to give a get then you will fail. He will move if he thinks his wife’s family is after him,fall off the grid and it will be 10 times harder for anyone to find him and convince him to give the wife a get.