Parent: You'll understand when you [insert age/stage of parenting]
Child at that age/stage: it hurt me when you x, y, z; I don't do that to my kid/don't understand why you did it to me.
Parent: Why do you always focus on the negative and hold grudges?
Parent: You'll understand when you [insert age/stage of parenting]
Child at that age/stage: it hurt me when you x, y, z; I don't do that to my kid/don't understand why you did it to me.
Parent: Why do you always focus on the negative and hold grudges?