OK Tanzilla, it would seem to me that you already know that the exchanges are rude and why they are rude. How about rewriting the exchanges in a more polite manner and let us take a look. I would also say that your terse, "Please answer me" could be taken as a slightly rude request considering the previous responses to your post.
A -Would you like to play tennis tomorrow?
- No, I wouldn't.
in this sentence you should say the reason.
B -Teacher, open the window it is hot.
– Open it yourself.
the answer is also not right. you should say the reason.
Am I right?
please answer me