I am probably a little more lenient than 'in-correct' in reviewing this episode, but this is the one that turned me off about the show a lot. I will grant that probably a lot of parents have a rule banning makeup until a certain age, and I do credit Clair for keeping her cool here. But I have to think over the years that this did not have a major influence, for instance the campaign "Parents the Anti-Drug" has had I believe more effect. This I think was the first episode that specifically emphasized a parental act and not as much funny antics around the house. And it didn't seem to work.
The scene with Vanessa and Rebecca seemed to show off the sensitive issue of peer pressure, and it looked like that was completely ignored!
As far as something interesting what 'in-correct' says: "If Claire gets this angry over THAT, then you don't want to see her get angry if one of her kids does something actually bad. Vanessa Wearing Makeup isn't illegal, but if she drove and did drugs and alchohol and assisted Theo in the raiding of the places with the food, then that WOULD be, and something to be furious about" -- you can check out the episode "Off to See the Wretched", that was where Vanessa seemingly was headed for a life of crime and an indication of how the parents' control was not effective.