Yeah...it is the feeling behind the words. If i said 'eat shit and die!' to a friend, what i would really mean is 'you're bugging me sooo much right now, but i love ya anyway'. And i'd have a big grin on my face when i said it, and they'd know what i meant.
If, however i said it to ....oh, i dunno, let's say Adolf Hitler...then i wouldn't have a grin on my face, and i would mean it quite literally.