This phenomenon of talking like the other gender or a cartoon character etc happens often but indicates somewhat low proficiency, even if the speaker is “fluent

This phenomenon of talking like the other gender or a cartoon character etc happens often but indicates somewhat low proficiency, even if the speaker is “fluent” in the literal sense of speaking smoothly without halting. Really learning a complex modern language (as an educated adult) involves having understaning of multiple registers like slang, casual conversation, news, formal, ceremonial, poetic language etc. So if you can’t recognize “I’m speaking like a girl” and stop doing it you have a long way to go I would argue.