People try to pick Thor up every so often. I try to tell myself that they are just ignorant, and I tell them he doesn't like to be picked up. That deflects 95% of picker-uppers, but some people PICK HIM UP ANYWAY!! And then they usually say, "oh, he doesn't seem to mind."
One time a pair of college girls were cooing over him, and one of them picked him up. The other one immediately told her that was rude.
I always thank people for asking if they can pet him or pick him up (though I don't let them pick him up).
The other thing I can't stand is when I tell people Thor doesn't like other dogs, and they bring their dog over anyway.