That sounds like someone I also must have daily contact with. Although he still gets me down sometimes, I have been working on a) distancing myself, b) reminding myself that nothing he says matters because I cannot trust it to be accurate, right, or non-meanspirited, and c) seeking comfort in other, more kindhearted souls. Maybe at least the latter two would help you.I don't want you to be miserable. You are my sisterbrother, and I want your suffering to be alleviated. Maybe my wish would help, who knows?