On AskMetafilter, a British woman with American in-laws poses a question about how to deal with cultural difference -- do I seem like "a snotty, cold Brit"? -- then proceeds to trash the hell out of the horrible, horrible in-laws she obviously cannot stand. She gets the answer she seeks: everyone assures her that her in-laws really suck.
She also gets some actual advice about how to get along with horrible people, which really is one of the great challenges in life, isn't it? (Or do you just avoid people you can't stand, even when they are in the family or your workplace?) Another great challenge in life is figuring out where to draw the line: When do you mark someone as horrible and realize what you need is a coping strategy (or avoidance)? As you've gotten older have you changed where you draw that line? Did you start writing people off more quickly or did you become more tolerant?
ADDED, bonus usage question: Since we have to say "in-laws," is there any point in preserving the fussy form "mothers-in-law" (or fathers-in-law, etc.)?