I try to remember that others don't realize that they are not the only ones being negative at the same time they are. There is only one of us but several of them so it appears to us to build up and like everyone is negative, etc. But it sounds like each person is just being concerned about themselves in relation to you; that your brother does not like your diet does not "add" to your parents not wanting to see one another at your wedding. I would confront the people, individually, when they bring up their pet peeve around you; tell them you do not wish for their negative comments, would like positive ones, you have enough problems of your own, don't need theirs!