I sometimes wonder if the folks in Japan aren't sometimes lost in their own world, and the personal space issue is annoying, but I guess that could be the same for any asian country with an overabundant population smashed together due to the lack of space. The olde timers that would stop all of a sudden, for no apparent reason, blocking the flow of people traffic flow always annoyed me, moreso than the constant bumping into one another..
but I will say that those that cause accidents, or traffic delays and snarls because they are driving and talking on their cell phones, reading the newspapers, eating, etc. are what annoys me the most...and these people are in the US as well...probably in every country....lost in their own little world with no regard of what's going on around them....