I like how you started out complaining about bad parenting but managed to make the whole thing about YOU in the last few lines. Masterfully done, but while you're mentioning that you're not a nanny, you should also announce that you "didn't come here to make friends!" More efficient.
It happens to all of us who eat supper there at one time or another, concentrate more on the man than on the whining need for everything or I'll go in a tantrum kid.