There seems to be a 500+ cap on responses.
Those are comments. Comments are not answers. Answers are posted by pressing the "Post Your Answer" button.
If you need to make a 600+ character long comment, then you're using the comment system wrong. Comments are for asking for clarification from a question/answer, or otherwise trying to improve a question/answer. They are not for engaging in discussion. If you're writing a comment that needs a code block, again you're doing it wrong.
If you're answering someone's question, you post an answer. That's your answer to the question. If you need to correct someone else's answer, don't do it in a comment (unless it's a small thing). You should add your own answer instead. You don't talk about the wrong answer in your answer either; you just post the correct answer. And probably downvote the incorrect one, possibly leaving a comment explaining where they went wrong.