I think a lot of sarcastic/dry humor tends to be more intellectual or about special subjects that others may not follow. If your family doesn't watch the same TV shows you do, they're not going to get that "type" of humor? Sarcasm is an emotional, competitive sort of humor too, it's meant to deliberately make fun of or put someone/something down and many people literally don't "get it" because they don't operate on that level. I was raised in a sarcastic household so use to be able to make people die laughing, literally :-) It can be like unwanted teasing, not at all gentle or friendly. Around people not familiar with that sort of word play, it can either go over their heads (they can't imagine anyone would say something like THAT) or wound badly because they are not comfortable with using words that way and take it too much to heart.