Elon Musk’s relationship with Twitter’s management has reached a new low after the social media company’s would-be-owner tweeted a poo emoji at the platform’s chief executive. The Tesla CEO was responding on Monday to a lengthy and nuanced thread posted by his Twitter counterpart, Parag Agrawal, explaining the company’s policy on spam accounts – an issue that had prompted Musk to announce on Friday that he was putting the $44bn (£36bn) deal on hold. Musk has disputed Twitter’s assertion that less than 5% of its users are fake or spam accounts and has said he will carry out his own audit. Agrawal explained that tackling automated spam accounts was a “dynamic” process that required fighting “sophisticated and hard to catch” actors. He added that some accounts that appear to be spam are in fact operated by real people. “The hard challenge is that many accounts which look fake superficially are actually real people. And some of the spam accounts which are actually the most dangerous – and cause the most harm to our users – can look totally legitimate on the surface,” he wrote. He added that estimating Twitter’s fake account numbers could not be done externally because the process required access to sensitive data such as IP addresses and phone numbers. Agrawal ended the thread with a link to a company blogpost on spam accounts, while revealing that Twitter had discussed how it estimated its spam number with Musk a week ago and that the company looked forward “to continuing the conversation with him”. Musk responded with a poo emoji, followed minutes later by asking how advertisers on Twitter knew what they were getting for their money. “So how do advertisers know what they’re getting for their money? This is fundamental to the financial health of Twitter,” he tweeted. On Saturday Musk tweeted that Twitter’s legal team had accused him of violating a non-disclosure agreement by revealing that the sample size for the social media platform’s checks on automated users was 100. Last month, Musk engaged with tweets criticizing Twitter employees, despite the entrepreneur agreeing not to “disparage” the company or its representatives while he completes the deal to acquire the social media platform. Musk’s behavior has prompted speculation that he is laying the groundwork to reprice the deal or walk away from it, which would carry the cost of a $1bn break fee for the world’s richest man. Some experts doubt whether the multibillionaire is serious about buying the company. “I honestly don’t know if Elon wants to buy Twitter,” said Drew Pascarella, a senior lecturer on finance at Cornell University. “At first, I thought he wasn’t serious. Then he paired with banks and financiers and came up with a legitimate acquisition plan. Now he’s called a timeout about an issue that is both well known and should have no bearing on his future plan for the company. If it’s attention he’s seeking, he has it. But does he want to own Twitter? Did he ever?”