It's funny. Normally I place a high value on civility and decency in discourse.
But I don't have any problem with this style of communication from Taleb.
I think it's because I've read/heard enough of his material over many years, and I understand the game he's playing.
He's not cruel, and he means no harm to people personally. Indeed he cares a lot about the general wellbeing of society and individuals, about avoidance of violence, poverty, oppression etc.
His whole approach designed to cut through bullshit and seek the truth.
That means being ruthless in breaking down the mechanisms people use to hide bullshit or smuggle it into important discussions - e.g., status/authority signals like titles, honorifics, academic/professional qualifications, academic processes, group memberships like Mensa, corporate/academic jargon, and politeness/courtesy when it's used to subdue people's efforts to seek truth.
His abrasive style is also a test: people who care about truth will not be offended, as they will welcome their ideas being challenged and scrutinised, because they'll win either way; either they'll be proven right, or they'll be shown to be wrong and they'll learn something.
People who have something to hide will respond by getting offended at his tone, rather than simply defending/explaining their ideas on their merits.
Related to that, he's fine with people being rude to him; indeed he prefers it, and he hates it when people try to flatter him or build rapport with him, because he knows that's the first step to being bullshitted.
There have been times when he's been savage about issues I hold dear, and that's been uncomfortable. But it's been a signal that I've needed to keep working to understand those issues more deeply so they'd hold up to any scrutiny.