To clarify: I don't take offense. But he says it almost every night, so it's getting to be like water dripping. And he does tend to be a little paternalistic in other ways, too, so that's probably a contributing factor. The reason it bugs me, I think, is the implication that what I'm doing is so much less safe than, say, driving, hence my "you, too".
The "drive friendly" comeback is nice, but probably not applicable, because he already does. He's actually really a nice guy, it's just this slight paternalistic streak...
But I didn't mean for this thread to be all about me - what else do you hear that bugs YOU?