"You should be ashamed of yourself," venture capitalist Steward Alsop told Tesla CEO Elon Musk in a September Medium post about a Tesla Model X launch event that started late and was marked by confusion.

Now Musk has canceled Alsop's Model X order, according to a Medium post Alsop posted over the weekend.

"I heard from our phone conversation that you feel that my post, 'Dear @ElonMusk: You should be ashamed of yourself', was a personal attack on you," wrote Alsop in his latest post, describing himself as "just a customer who felt he had been ignored at an event."

He reiterated his complaints from September: the event started late and attendees were shuffled room to room. Despite having put a $5,000 deposit down on a car originally set for release in 2013, Alsop did not get to test drive a Model X at the launch.

Alsop said it only makes sense he would address Musk, the CEO of Tesla and lead presenter at this launch. Musk apparently thinks Alsop is just being rude. The CEO doesn't see a problem with cancelling the order.

"Must be a slow news day if denying service to a rude customer gets this much attention," Musk tweeted a little after midnight Pacific time.

With the adage "the customer is always right" in mind, it might seem counterintuitive for Musk to double down on his disagreement with Alsop's complaints. Alsop said he just wanted an apology, after all. But Musk isn't just some CEO of a company, he's the guy who wants to colonize Mars. He's a little eccentric. 

Alsop is eating his words.

"Since we had our conversation, I looked around and realized that it is not possible to buy the equivalent of or even a pale copy of the Tesla Model X (or Model S, for that matter), which is real testament to how distinctive a product your company has produced," he wrote on Medium.

"I am mostly sorry not to be able to participate in the automobile revolution that Tesla started."