If your landlord has assorted renters in a complex where one specific group seems to be a "problem" as you have written from a hostility issue where the landlord receives complaints from his or her tenants about the situation, the landlord is under an affirmative duty to try and remedy the issue.In fact, many written leases have provisions within requiring the tenant to adhere to certain appropriate conduct and civility. From what you have written, your landlord needs to step into the situation and try to calm down the hostility.If the landlord refuses to get involved, I suggest that you consult with a landlord tenant attorney about the situation.