Does japan segregate?

Travel Info
My friend told me yesterday when he was stationed in Japan a few years ago that alot of places would say no americans and others etc. allowed
When he went out to eat they had to be reseated to a section way in the back
I can somewhat understand in the event that they may be rude in a place that is classy

but is it true
they openly segregate like this?

Travel Tips

Yes and no depending on where you and what you're trying to do.

The main idea here is that Japan sees you as a foreigner, and considering that the population is about 95% homogenous it's kinda easy to pick you out. For a lot of people in Japan, foreigners make them nervous and they want to have as little contact with them as possible. Sometimes it's as simple as not wanting to sit next to them on the train, or giving them a little more room when it's standing room only. There's nothing malicious about this, it's just something that happens.

Then there is the overt segregation where they specify a certain people or just lump all foreigners into one boat. In Hokkaido, there are onsen up there that will no allow any foreigners to enter due to what happened when some Russian sailors enterred one. They didn't behave like the Japanese did, were loud and bothered the other guests so the owners said that no foreigners were allowed. This is of course illegal to segregate but the government is slow to force these people to open their doors.

In certain other cases, like hostess clubs as well as soaplands and other such places, they have a strict Japanese only policy which is odd because half the women working there are foreigners themselves. Some of these places will allow a foreigner to enter but only if he's accompanied by a native Japanese.

Most places however don't do this so you're more or less free to go wherever you want.
Others

Depends. We lived in Okinawa for 6 years and I never experienced the discrimination that some people say they feel. Some places do not put english on the menus (maybe so Americans wont come?!?) While we were there a guy lifted a school girls skirt and there was a major protest but that was about it. (Most of the Japanese love the Americans because when they work on the base they get payed by there gov.. About twice what the Americans on the base are being paid.. And they get to shop on base which is WAY cheaper than in town)
USMC brat.. US born Okinawa Raised
In Japan, as everywhere in the world, racial discrimination is illegal.
I don't say it doesn't exist, though.
There are stupid people all over the world.
Stupid and rude people will discriminate you wherever you go and whatever you do. And the others are fighting this .

It seems to me that the Japanese society has established certain rules in dealing in foreigners,because many foreigners, who come with zero knowledge of Japanese culture, and 100% eagerness for adventure, sometimes step over the limits. It hurts, because it really can be accepted as segregation, and looks unfair to those who always try to follow the rules and to live in harmony with the Japanese society.If they want to protect themselves, though, I cannot blame them.
absolutely true!
I've never seen any signs like that you mentioned in anywhere in Japan. Perhaps, some places by the military base don't want American soldiers to come in, because some people DO cause a lot of trouble, like robbery, getting drunk and destroy their property or assaulting other people. Japanese people DO NOT dislike American people.
With the reason you wrote, they basically refuse to enter those ppl, not to segregate.
Even noisy Japanese will be refused or kicked out.