[Tangram]

Oh my.

First off, you obviously joined this forum specifically to tell us this, with no other motive, such as becoming a part of the community. You probably planned on looking for any thread where you could possibly recount your tale. This is initially rude. It's kind of like trying to become someone's friend just so that you can use them in some statistics report. It's also known as a form of trolling.

Now, about your experience (if it's true). I can believe in someone getting mugged in broad daylight in Tokyo. If a child can get kidnapped right outside of a police station in my US town, a mugging in Tokyo is possible. I do, however, doubt that it was because you were white. Like MMM said, few Japanese criminals go out of their way to target whites. If anything, they may have targeted the tourist that looked like he might carry almost all of his spending money on him at once.

The no foreigner signs I have a very hard time of believing. I've never been to Japan, but everything I've heard leads me to believe that in Tokyo you only find very many no-foreigner signs in the red-light district, and for a good reason, honestly. Are you sure you didn't maybe catch sight of an old-fashioned guest-house with a no-foreigner sign or something, and then exaggerate it to being that the signs are everywhere? Tokyo's economy would waver a bit if no-foreigner signs were as common as you claim. Westerners are easily offended by that sort of thing, and it would likely be mentioned in travel journals rather often.

Maybe you're just not the type that ought to travel, eh? Perhaps you have a nice comfort zone in your own culture, and leaving it makes you antsy. That's fine, lots of people are like that. I have a feeling you'd have a similar experience with just about any big tourist-destination.