When it comes to Kanji from Japanese, it gets annoying upon people misidentifying it as "Mandarin". Don't get me started on writing Japanese names all in Kanji since that too gets mistaken for "Mandarin" (i.e 近藤浩治) when it's not. I mean let's say you're learning Dutch and can that get misread as "German" since the alphabet is near identical.

The thing is, if you're learning another language (i.e. a Slavic one like Ukrainian, gets mistaken as "Russian" due to Cyrillic), you get the picture. It happens A LOT with 漢字, even if I handwrite in nihongo (not zhongwen) Like, are you able to distinguish which character set is Japanese & Mandarin since they both use 漢字:

Similar things are similar if you're not a specialist enough to see intricate differences. Don't understand your question.

I can comprehend Spanish pretty well and Portuguese can sometimes still trick me for a sentence or two. Languages in particular have very blurry lines between them. Linguists cant fully define what a dialect is either.

When it comes to Kanji from Japanese, it gets annoying upon people misidentifying it as "Mandarin

They are literally Chinese characters that the Japanese also use. Chinese people have migrated to and from Japan for millennia, so they have language in common.

It's like, is the word "Animal" French, English, or Spanish? The answer is all three. They all share the root word from Latin, animalis, which influenced all of them.

Because Japanese and Chinese characters look similar to those who do not speak/read those languages. I'm sure the same is true for the Roman alphabet.

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Because not everyone has developed the schema required to differentiate those scripts or the knowledge base to identify them, and not everyone needs to. This is a non-problem and just about the pettiest complaint you could make.

Unless you're reading ancient Japanese texts, or looking at an isolated word on a sign or something, it's not really that much of an issue for Chinese and Japanese, even as someone who's never really gotten that far in Japanese. In a longer text, the total absence of hiragana and katakana will generally make it readily apparent it isn't a Japanese text, in most cases, even it there aren't any characters used which you can point to and say "Ah, this is a simplified character from China!"

With Romance languages, either the language is close enough to something I know that I can read it without issue, or it's not and I can't understand it without first studying that language's orthographical conventions and any unique grammar. Still, it never really amounts to more than either "I can't understand this" or "Huh, looks like Portuguese, but I guess it's Galego if they use ñ and spell geografia as xeografía. Well, guess I'll see what it says."

Don’t get me started on writing Japanese names all in Kanji since that too gets mistaken for “Mandarin” (i.e 近藤浩治) when it’s not.

If you think this example would get mistaken for a Chinese name that says more about your Japanese level than anything else, lol!

I don't understand this issue. Who is misidentifying your writing?