Rapper Future was put on blast Monday for promoting his Halloween concert at Las Vegas hotspot Drai's just 12 hours after the deadliest mass shooting in modern American history.

The outrage was fast and furious for the 33-year-old Grammy nominee - last seen in Australia on Sunday - after he or someone on his team posted a flier for his October 28 gig on Twitter and Facebook.

At least 59 concertgoers were killed and 515 more were injured when a 'crazed lunatic' opened fire on the crowd gathered for the Route 91 Festival in Las Vegas on Sunday night.

The sniper was identified as Nevada resident Stephen Paddock, 64, who took his own life while still on the 32nd floor of the Mandalay Bay Resort and Casino.

'All the s*** goin on in Vegas right now,' Twitter user Boogie2x_ wrote.

'Take some time from thinking about yourself & promoting a concert.......in Vegas.'

Twitter user TjaderDaRaider tweeted a funny meme from Oakland captioned: 'Too early bro.'

Mikhail Maniyan posted a gif of Jonah Hill giving the 'cut it' hand motion, while Shaella Askew posted a gif of Steve Carell making a cringe face on The Office.

On the other hand, a Twitter user called 99PrimeTime defended Future by pointing out that it could have easily been 'a scheduled tweet.'

And a Facebook user called Mario Honeycutt wondered why 'all the white people saying bad tyming lol.'

The Atlanta hip-hop star - who boasts 23M social media followers - was warmer about the devastation (and 75 fatalities) caused from Hurricane Harvey, 'Pray for Houston' back on August 27.