As a chinese I feel offended, but somehow I get used to it. ╮(╯_╰)╭ Actually I made a edited version of this pic which I'm not gonna upload, considering Japs sometimes are more easily to be offended.
I always laugh when the Japanese try to mock Chinese culture
since, you know, they're completely indebted to China for basically everything. Certainly not excluding their language, which is mostly comprised of Chinese vocabulary.
Don't be ignorant. There's always a heavy influence of each others cultures in Asia but that doesn't mean the cultures aren't unique. Chinese culture is in fact, much much more different from Japanese, same with Korea. I won't even go into how wrong you are about the "mostly comprised of chinese vocabulary" nonsense. All I'm going to say is that (almost) all kanji words have at least 2 different pronounciations, one is the "on" reading and the other is the "kun" reading and the one that sounds nothing like chinese has been around longer.
Just because the language uses similar words doesn't mean they are all the same. I can argue argue english, french, spanish, italian are all the same because they all descended from Latin. But that'd be ignorant on my part, wouldn't it?
Maybe you can't tell the difference, but don't spread your ignorance.