Completely anecdotally - the impression I got when discussing Corbyn is people actually didn't dislike him personally at all, which surprised me. They just disliked what he was representing.
I feel like many people thought he was correctly identifying legitimate economic and societal problems we currently face and will face in the future, but was then applying solutions that stopped being relevant 40 years ago to those problems.
That was it for me for sure. I thought he was an idealist, I have no doubt he genuinely held his principles. But I also personally had no doubt that his 'solutions' to problems would actually cause more harm than good.
For a quick example, free broadband - would mean everyone had free crap broadband, but stifle the marketplace to make good broadband harder to attain, stifling innovation. The "NATIONALISE EVERYTHING!" approach was also another example of his ideology being dangerous - his supporters deny that was happening, but it's right there in the 2019 manifesto; he wanted to nationalise pretty much everything.
These are examples of the problems people had with Corbyn - many of his policies were fine, like housing as one example, but it very much felt like there was a thin veil over what his real intent was, and it was an extreme left agenda that would have hurt the UK badly IMO.
I disliked him personally in only one area, which was also his strength - his stubborness. His decision to oppose the IHRA definition of anti-semitism just to make a stupid point was the final of many nails in the coffin for me; it showed that he was an ideological extremist and had no place in a position of power as a result.
