Donald Trump’s top economic advisor Stephen Moore on Tuesday demonstrated an apparent lack-of-knowledge of just how insurance works, telling CNBC’s John Harwood “people want insurance for their own families, not other peoples.”

Moore was explaining why it’s unfair to have an insurance system where healthy people subsidize sick people.

Trump adviser Moore on unfairness of the healthy subsidizing the sick: "people want insurance for their own families, not other peoples' "

— John Harwood (@JohnJHarwood) September 19, 2017

The Internet on Tuesday was not impressed by Moore’s statement, noting the top Trump advisor appears to not understand what insurance means:

One thing I've leaned in 2017 is that a stunning number of "conservatives" have no idea how insurance works https://t.co/wJjp0p5qOL

— Aaron Rupar (@atrupar) September 19, 2017

He literally does not understand how insurance works. https://t.co/G8mAMgy6BI

— Jeffrey Goldfarb (@jgfarb) September 19, 2017

I guess we can call this one the Fuck Society insurance plan. https://t.co/O0hwgM9bb5

— Natalia Antonova (@NataliaAntonova) September 19, 2017

these craven dipshits have no clue what insurance even is https://t.co/Ap1NaoDdK1

— kris pissedofferson (@JoshhTerry) September 19, 2017

He and those like him quite literally do not understand how insurance works. So much is in danger of being undone by the stupid and selfish. https://t.co/rMSR7FLKs4

— Jason Fry (@jasoncfry) September 19, 2017

How does he think insurance works? https://t.co/oCmL6xFQyl

— Josh Billinson (@jbillinson) September 19, 2017

BREAKNG: Republicans don't understand the concept of "insurance". https://t.co/cbbO43vYbp

— ☪️ Charles Gaba ✡️ (@charles_gaba) September 19, 2017

1. The whole point of insurance is broadly-spread risk, no? 2. The line between healthy and sick often vanishes suddenly. https://t.co/eyKjoDqWrD

— Cathleen Decker (@cathleendecker) September 19, 2017

This is literally how insurance works. https://t.co/ZQPTSVq11h

— Matt Largey (@mattlargey) September 19, 2017

So…they're against the basic concept of insurancehttps://t.co/5kcjox3pq7

— Alice Ollstein (@AliceOllstein) September 19, 2017

Healthy people subsidizing sick people is literally how health insurance works https://t.co/dmgG79k8E1

— Roberto Aram Ferdman (@robferdman) September 19, 2017

"Insurance" pic.twitter.com/XPXjGsW9La

— Andy Wright (@AndyMcCanse) September 19, 2017

"What does 'insurance' mean?" Twitter is the worst Twitter.

— Josh Barro (@jbarro) September 19, 2017

I pay a huge monthly health insurance premium. My recent foot fracture was my 1st visit to doctor in 11 yrs. I'm happy to subsidize the sick https://t.co/Bdi3zB06vG

— Cindy Gallop (@cindygallop) September 19, 2017

I'd like other peoples' families to have insurance too. https://t.co/uKAsXywgkf

— Derek M. Young (@DerekMYoung) September 19, 2017