I met a few JW's in Japan. Apparently they aren't supposed to socialize outside of their faith unless they are attempting to convert teach.
The rudest asses in Japan I encountered? LDS & JWs. They would walk through wedding photos, family events, they walked through a big family greeting... None of it was on an open path either. They went out of their way to be assholes.
They didn't realize that most of the family spoke English.