I think you're supposed to support the customer in this situation, but I think we can all agree that most kids are 'f*ckin needy.'
According to BuzzFeed, "the incident happened at a sports bar in St. Louis, and the owner of the bar told The St. Louis Post-Dispatch that it was a joke only meant for the kitchen." They further stated that the owner said kitchen notes are generally taken off the receipt, but they simply forgot this time.
Given the fact that society nowadays mandates that people get OUTRAGED about things, the man with the needy children let his fury be known on Friendlys Sports Bar & Grill's Facebook Page.
In conclusion, everyone is entitled to all things at all times, and if someone acknowledges something that they don't like, they should burn furiously.