I’ll never forget the first time I assisted at an SSPX mass. A nice fellow named Joe greeted me after mass and within 2 minutes of talking he said to me, in a very serious tone: “watch out for those sedevacantists!” I laughed and said, “Joe, I’ve held the sedevacantist position for years”. Needless to say he was speechless.
Another person, at the same chapel, said to my brother, when he found out that he held the sede position, “you can’t be a sedevacantist, you’re too nice!