To stay with people as an example: die Tänzer would mean plural right? But as an answer to a question, it might be confusing. Let’s assume you’re asked: „Wer war gestern Abend auf der Bühne?“. Assuming both participants know it’s an establishment with either several dancers or one female act, misgendering the female dancer trough omission of the correct ending would lead to confusion, since the false answer would be the same answer as the one being given by someone overwhelmed with gendering: „Die Tänzer“.
That is by definition confusing. Just because you can accommodate for it, doesn’t mean it isn’t initially.
About the moron part: that does really depend as well. I happen to work with a few people who are not German native speakers and tend to be very articulate in English. The way they often misgender common words in German really takes away from their credibility, since it happens so often. Doing it once or twice can be excused, but doing it often does not help you seem intelligent.