I don't think you should give anyone in the congregation a cold shoulder, but I really recommend that you do speak to the elders in your hall about how you feel, also keep aware you don't have to brush them away, but perhaps engage in more spiritual things than recreational matters, that goes too for the brother you are trying to help. Remember one can help people, but don't neglect yourself, because that can be bad*(we all need constant encouragement, even those who appear strong*).Individuals need to make the truth their own, most of the time alone, so it can have an everlasting effect not temporary.