I registered for a class on the second day of the week and missed the first day of class. Ultimately, I didn't understand the homework schedule and thought that the dates on the chart were the dates assigned, not due. So I eventually found out that I wouldn't be prepared for class today and would be unable to turn in the homework. I emailed the teacher to explain my confusion and he responded saying that he "made it clear that the homework was due on Friday," despite me being new to the class. However clear he was, it wasn't clear enough for me, or the other student that joined late and didn't have his homework today, either. Is there a polite way for me to reply to him explaining that I wasn't the only one to misunderstand him? Or would that seem too disrespectful, and should I just let it go?