The Last Samurai Syndrome is a syndrome where it is best associated to a certain type of weebs that are so obnoxious about defending any criticism of the Japanese Culture whether they have been there or not.
Jared! Look at this idiot over there, he has The Last Samurai Syndrome.
Non-Japanese people who think they are only ones who can save Japan from any criticism of the country as mild as it could be.
"That's a very funny looking bath tub" - Buddymate
"Yeah and that bee larvae is disgusting" - Boring In Japan
"Respect the culture!" - Random Weeb
"What's with him?" - Buddymate
"He has Last Samurai Syndrome" - Boring in Japan
When a weeb who's never been anywhere near Japan feels like they have to protect every facet of Japanese culture even though they don't actually know anything about Japanese culture beyond what they see in anime.
"Dude....Why's that Evangelion T-Shirt wearing neckbeard over there screaming at someone because they said they didn't like sushi?"
"He's suffering from a case of Last Samurai Syndrome."