I don't have a problem with someone passing me on a double yellow if it's safe to do so. Typically passing a cyclist (especially my slow butt lol) takes much less distance than passing a car, so passing on a double yellow usually isn't a problem unless you're right there in the curve or just before the hill crest. Passing on a blind curve or hill is one thing. But passing when there is plenty of visibility (usually a dashed line) with a car coming right for you has to be the dumbest of the dumb things to do.