Entitled parents are a nightmare because they tend to produce entitled children who they then also don’t control. They can sort of be avoided now and then, but if you end up stuck somewhere, like, say, a flight (or submarine) then you are just out of luck.
This is exactly what happened to one airline passenger who had the cosmic misfortune of being seated next to a mom and child, the latter of which demanded they hand over their soft drink. He went online to share the tale and commenters also recounted their experiences with parents who seem incapable of stopping their marauding children.