Nobody is saying it's too confusing. They're saying "stop claiming that word for yourself".
Your examples are incorrect. The equivalent would be if France was called The United States of Europe, and used the word Europeans to refer exclusively to themselves.
Then, naturally, Germans would stop using the word European to refer to themselves because others would think they were referring to France (The United States of Europe in this example).
Nobody is saying it's too confusing. They're saying "stop claiming that word for yourself".
Your examples are incorrect. The equivalent would be if France was called The United States of Europe, and used the word Europeans to refer exclusively to themselves.
Then, naturally, Germans would stop using the word European to refer to themselves because others would think they were referring to France (The United States of Europe in this example).