I saw a version of this on Facebook and loved it. I added/changed the last three lines, but the overall message is unchanged.
The Girl you just called fat? She's been starving herself & has lost over 30lbs.
The Boy you just called stupid? He has a learning disability & studies over 4hrs a night.
The Girl you just called ugly? She spends hours putting makeup on hoping people will like her.
The Boy you just tripped? He's abused enough at home.
Every person has a story.
Accept differences. Show kindness.
Zero tolerance for bullying.