if you can't take it, (then) don't dish it out

If you don't want to hear someone else's harsh criticisms, gibes, or insults, then don't say those kinds of things to them. You were all over your sister about her eating habits, but you start pouting when I point out that you had a cupcake for dinner last night! If you can't take it, don't dish it out. You know, people might criticize you after you criticize them. So if you can't take it, then don't dish it out. Well, then, don't tease your brother like that then! If you can't take it, don't dish it out!