That would have to be the rational response to it, which has been almost pure derision, much of it quite amusing. As Mollie Hemingway at The Federalist says:

There's hope for humanity RT @TJBreen: I genuinely cannot find any takes on #Rationalia that don't consist of brutal mockery.

— Mollie (@MZHemingway) June 29, 2016

Agreed. Other highlights:

In actual #Rationalia, nobody comes up with creepy fascist ideas like "Rationalia"

— David Burge (@iowahawkblog) June 29, 2016

#Rationalia this has potential as a gulag for nerds

— Harambe_of_Snarth (@BenghaziExpert) June 29, 2016

I feel like there's going to be way too much D&D in #Rationalia

— Happy Li'l Tree (@karengeier) June 29, 2016

#Rationalia should revert to its pre-colonial name: #Smuglandia

— Sonny Bunch (@SonnyBunch) June 29, 2016

#Rationalia is what Russian citizens used to call Soviet Russia under Stalin https://t.co/R8q7nNMttC

— actionboss (@ActionB0SS) June 29, 2016

Imagine proposing #Rationalia when phrenology and eugenics were mainstream! Death warrants aplenty!

— Kelsey D. Atherton (@AthertonKD) June 29, 2016

#Rationalia is quite a movement. Twelve citizens, including a duplicate. https://t.co/ShOgXTYbfs

— Jeryl Bier (@JerylBier) June 29, 2016

Half our people starved because I forgot to carry the two! Just another beautiful day in #Rationalia! https://t.co/9Zl5uLg6Hu

— CastletonSnob (@GarbageApe) June 29, 2016

@neiltyson "And based on #Rationalia law 246-2, 'survival of the fittest', all underperforming individuals will be killed." Love it Neal.

— Stephen DeAugustino (@DeAugieDogie) June 29, 2016

i got your #Rationalia right here pic.twitter.com/bYJ2DYGX1c

— humanpizzog (brexit) (@HumanPog) June 29, 2016

"Earth needs #Rationalia, with a one-line Constitution: Give me power, because I'm smarter than you." — Leninhttps://t.co/AAaODqOGH6

— Ben Shapiro (@benshapiro) June 29, 2016

Just got back from #Rationalia. Was having a lovely conversation in Welsh with a woman wearing a niqab. But the police promptly killed her.

— Michael B Dougherty (@michaelbd) June 29, 2016

Follow the conversation about Neil deGrasse Tyson’s brilliant idea at Twitter. This may be the feel good story of the day.
Photo credit: Pop Culture Geek [CC BY 2.0], via Wikimedia Commons.