You might think Bryan Johnson - the millionaire biohacker who is dedicating his life to reversing (or at least slowing down) aging - might not have enough time to come for people on social media.
After all, he's surely busy undergoing plasma transfusions from his son and going to bed at 8:30pm every night.
But he's managed to carve out time in his busy biohacking schedule - and he's got Tesla billionaire Elon Musk in his crosshairs.
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"The difference between Elon and me: I’ll nourish you and drink your blood; he’ll fire you and leave you to die," Johnson posted on X - the social media site formerly known as Twitter, that's owned by Musk himself.
Yikes. So what spurred Johnson to post this savage takedown?
What happened is entrepreneur Matt Paulson posted two pictures of Johnson on X - one from before he started biohacking and one now - with the caption: "My unpopular opinion of the day is that Bryan Johnson looked way better before he started spending $2 million/year on his body."
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Musk replied to the post with the '100' emoji, suggesting he agreed with Paulson's take.
And Johnson then jumped into the conversation, replying: "Former Bryan didn't get invited to vampire cosplay as himself" - presumably poking a bit of fun at the people on social media who dubbed him a vampire after injecting himself with his son's blood.
Johnson - who reportedly spends $2 million (£1.59 million) a year on his anti-aging project - screenshotted this whole exchange, and posted it with his takedown of Musk. He even took the liberty of circling how many likes their respective posts had received - Musk's emoji had 1.4K likes, while Johnson's reply had 1.7K.
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But in the comments, people just want them to make up.
"Need you both. Elon will get us to space eventually. You will make sure we're still alive to get there," one X user replied, while another said: "Actually pretty sad seeing you two picking fights."
As of yet, no response from Musk on the matter - so it seems like a bit of a one-sided conversation.
Johnson doesn't seem too bothered by the criticisms of him online, and said in a YouTube video: "No matter how extreme I've had to be, no matter how eccentric people perceive me to be because I'm outside the norms, demonstrating that age can be arrested would change everything."