Dear *insert mean word*
It has come to my attention that you are making people feel horrible and I personally find it a disgrace I mean what have they ever done to you. Why do you pick on them? So if your reading this or not actually take time and realise what you say.
From someone who thinks your rude

Dear "Popular" kids at my school
You have no right to make up rumours about my friends and I. I mean we don't do it to you. I mean just stop.. Just stop taking your phones in class your disrupting us. Stop talking back to the teachers they are trying to be patient with you.
From someone who is getting annoyed

Sorry about that and sorry if it affends you in any way it's just school is school (sadly not hogwarts) and I have been mad at these people for a while