It's rude to insult your child.
Pat was playing catch with his son, who doesn't have the strongest arm.
Pat wants to comment on his son's arm.
Pat tells his son that he'll throw harder as he gets older.
Pat tells his son that he throws like a girl.
Pat's son feels more confident and isn't as bothered by his weak arm.
Pat's son's feelings are hurt , and he starts becoming insecure.