It depends on who you are—if you’re not Japanese or Chinese or at least Asian, you need to stay out of it.
There are a lot of Asian weeaboos who develop an obsession with Japan out of a kind of survival mechanism. White culture in the US frequently places Japan on a pedestal while mocking Chinese culture, so identifying more with Japan is a strategy to reduce racism and improve social standing. But ultimately, it’s playing at a racist game, and most people who get sucked into playing it find it very harmful to themselves in the long run in terms of self-esteem.
I strongly believe in being compassionate about this dynamic. Outsiders looking in and making fun of non-Japanese Asians for wanting to “be Japanese” are only contributing to the problem—they’re not being friends to Japanese or non-Japanese Asians. Any white person who makes fun of other Asians for wanting to be Japanese is the worst kind of racist hypocrite, because they (white people) are the people who created the problem in the first place, and actively maintain the ridiculous “which is the best Asian” racial hierarchy.