Is shunning a harmful neighbor who disregards the rights of neighborliness considered a sin in Islamic law?

The worst of people is he whom people abandon to guard against his evil. With such a person, if he is a relative or a neighbor, the minimum connection suffices, and greeting him with 'salam' upon meeting him. This is what is advised with an annoying neighbor: to avoid friction with her, and there is no severance or abandonment in that; for refraining from visiting does not necessitate abandonment.