Interestingly, i don't see it in my east coast experience. Of my spouse's 9 siblings and their dozens of kids, grandkids, relatives, friends etc., the range is from opus dei level of belief, to priests and Jesuit brothers, to those very involved with a parish, to casual Mass attenders, to "easter" and cmas eve attenders, to catholics in name only, to outspoken agnostics, many many atheists, some JWs, Baptists, Protestants, non-denominational church goers, etc.
In the 30 or so years since i left the LDS church and have been part of this group, NOT ONCE has one single person EVER made a judgment on anyone else about their anticipated after life status. NOT ONCE. Not at funerals, not at marriages, not at parties, not in conversation. NOT ONCE.
Maybe you are experiencing other conservative groups, but in my experience, people do not isolate, separate, and shame family members on the basis of religious belief like Mormons do. in my opinion, Mormons really seem to have the market cornered on that particular level of family hate, disparagement, and shaming.