Even Corbyn, were there actually are political differences with his internal opposition, is hated more by them because he isn't one of them than because they object to anything he actually stands for.
This. These days, even at places like Davos, it's very a la mode to make a big fuss about how attuned and sympathetic one has become to the struggles of the valiant but hapless commoner.
Of course, the solutions they come up with are almost invariably idiotic - what if health insurance but also Blockchain?/Let's teach displaced Bangladeshi farmers how to code etc. - because the one thing that is most necessary to meaningfully improving things is the one thing they will never accept: the transfer of political power away from oligarchs into the hands of everyday people.
Some of the more enlightened Holders of Capital could actually be coaxed into a slightly more egalitarian agenda than what we've been forced to endure lately (partly because they are making so much money from rent-seeking these days that they
literally can't give it away fast enough!) - but only so long as they are certain that the authority to proceed or not to proceed along these lines remains entirely under their control.
A minority could just about get on board with a more constructive role for government, but only after The Economist gives them permission first, and only if it was led by some former economist or banker who'd had an epiphany after accidentally visiting Blackpool, and who looks and sounds like a TED talk.
The conflict is less over policy than it is over who wields power.
The text of the 2017 Labour manifesto was not much different from the 2015 version; what spooked them was the implication of an organised and motivated political movement no longer subject to media conditioning or enlightened leadership's control.
Of course, this only underscores why mass politics are the only way to accomplish goals of existential importance, like definancialising and decarbonising the economy - and why Elisabeth Warren types, who think solving our problems is just a matter of turning up in the capital and hiring Smart People to implement Smart Policies, are the Ned Starks of neoliberalism.