I'm not sure why he's quitting then. That's exactly what he brought up in his resignation blog post.
Well, there would be the swastikas and the bags of feces. These aren't traditional welcoming gifts anywhere I know of. Let's see, pulling fire alarms, pulling speaker wires, being spit on, more investigations ...
It's all right there, in the article. In case you are still not sure why he's quitting.