Earlier quoted context omitted.
I think when you experience prejudice regarding your race, it’s unfair to characterize that as “stewing”. Maybe you don’t find this article or his initial piece insightful; that’s fair enough. But I also think it’s fair of him to shine a light on unfair treatment in the place he lives, without people suggesting - without irony - that he “go home”.
It's not "unfair treatment," it's perfectly normal for people to feel more comfortable around their own. They don't know if this guy knows train etiquette, if he has body odor - only around 10% of East Asians do, or maybe it's just that he's wider than the average Japanese person, as it appears so from his picture. He's a guest in their country, and it's impudent for him to think he has the right to be sat next to at…
1. he may not be in a position of being able to leave easily after this long--a random example could be a significant other who does not speak English well.
2. the attitude this comment takes (and I've been living in Seoul for the last four years so I've spent a while thinking about this[1]) is absolutely unacceptable to most people if placed in a western context. Different race? He's a guest in their country!
What is it about East Asia that makes this attitude so tempting? is a question that doesn't let go once it gets its hooks into you. The ethnic homogeneity of Japan/Korea and to a lesser extent China must be a part of it. Race and the assumed privilege (privilege to leave, etc) of being a westerner also factors in.For example, things would be murkier if the author of the article were a labourer from SE Asia. But I haven't fully worked it out yet and maybe never will.
[1] Koreans don't do the empty seat thing when the train/bus is crowded. I'll also note that I've been an enthusiastic proponent of "if you don't like it leave" at various times, depending on the situation, and am not pretending to have all the answers.