I like Sir Keir - one of the few decent politicians around just now, I think. But, although I've voted Labour in the past (not consistently), I wouldn't call my self a Labour voter.
I would be hard pushed to name anyone on either side of the HoC at the moment who I would trust or be able to respect. I think, in the days of Jeremy Corbyn, many people just didn't like him or the people around him. Jeremy Corbyn was a strange man - with some very worrying influences - eg anti-semitic lobbyists. It may not be his fault that his brother is a climate-change denier and anti-vaxxer, but it doesn't exactly inspire confidence. There was definitely a feeling that he was prey to some 'dark forces'. And he had zero charisma or personal presence - couldn't imagine him dealing with foreign leaders very effectively.
I would have answered your question until recently that people tend to think that Labour won't manage the economy properly but...ahem...the current lot seem like a complete disaster.
I'm NOT convinced by any party - I agree/disagree with aspects of both Tory/Labour policies but I would say this: I think sometimes the left wing of the Labour party give the impression that they think it's all about wealth redistribution. As the Tories used to constantly say - you've GOT to create that wealth first, and it's no good pretending otherwise. So we need to encourage and reward initiative, hard work and enterprise through the tax system. Disclaimer: I'm not advocating the extreme changes which have taken place over the last week, though!)
Your question was about why people don't like Labour, and I'm just trying to answer that. This word 'socialism' - it's much misunderstood, I think. If the Labour Party were truly socialist, that's pretty radical and I don't think many people would support them. If they are social democrats (I think that's more accurate), then fine - not so scary. Make no mistake, socialism proper would mean the forcible confiscation of property etc, and that's never going to be a popular idea. But I'm not saying the modern Labour Party is truly socialist, than goodness.
I support the NHS, BBC and welfare state (limited though). I wish railways and utilities hadn't been nationalised (although I'm old enough to remember how appalling the old British Rail was!!!). But I'm not one of those people who gets wound up because some people are much richer than me - of course life is unfair and unequal, and it was in the Soviet Union and any communist country too.