They already hate their family, so these types of situations help them bottle up even more resentment. See them looking dead inside at the food court, obviously wishing they were at home playing XBOX or PS3 instead. Mom and dad thought heading to the mall would be a fun bonding experience, but these ungrateful spawn would rather just get shit bought for them or delivered straight to their door. After all, they've got Facebook statuses to update, texts to send, and tweets to tweet.