Right, just like I wasn't able to quit smoking after a 25-cigarette a day habit over 10 years ago and haven't looked back? Or how no one is ever able to keep weight off? Or get off heroin? Or change their lifestyle?

Maybe ask: "What are you doing to try to ensure you'll keep your kids off screens and active?"

Or

"Do you have any experience trying to give up addictive behaviors, and how are you helping your child deal with it?"

Snarky comments, especially those that involve assumptions ("you're using willpower") just make you come off as 1- a person who has never accomplished anything of note and isn't worth paying attention to, and 2- a naval gazer with neither the curiosity nor intelligence on how to approach discovery.

Learn how to be inquisitive, then you can be judgemental