Little "offhanded" remarks like
You look like you've gained some wight
Too bad you didn't get an A
Maybe next time you will hit the ball
We don't have enough money
Your acne is bad maybe you should wash your face more
Turn your words around
You are beautiful!
Way to go on that test!
I am so glad you are playing ball!
We are rich in family!
You are beautiful just the way you are!
Words have Power - use them for the good!