[Tatsujin]

Abasio is absolutely right.

The main reason in most clubs to hang signs preventing foreigners to enter is the american military personnel. It seems like the most problems caused in public places are because of the american military on a leave in the nearby towns. One thing that is visible too is that alot of clubs require a passport or an ID to enter, surprise surprise, the american military personnel don't have either.

Other part is the fear for the foreigners familiarity with the japanese customs and manners. Especially tourists usually cause more trouble than they should when entering an establishment without even a basic knowledge of the japanese language. English just doesn't cut it most of the time.

All in all it is mostly because of the military presence. No offense, but most of the time it just goes over board...

But yeah, just to not so biased, every nation in the world has people who just don't like foreigners. Claiming that "no, not the JAPANESE. They SEEM so NICE" is just absurd and to tell you the truth a pretty childish notion.