I don't share his politics, but I do have the capacity to respect people that I disagree with. I don't respect Corbyn as a leader. He also has low respect for convention and uses everything as a cheap pot shot to poorly make a point. To be an effective leader, you have to work with convention to some extent, you can't blindly do your own thing.
Like TM's failed dogged determination to push through her deal, he still regurgitates the same empty nothingness. In three years of opposition to a deeply unpopular government, he's failed to establish a secure policy with regard to Brexit. He has a party sullied by constant claims of anti-semitism. His policies don't have the trust of far too much of the electorate.
9 years into weak Conservative government propped up by coalitions and minority parties, any competent opposition leader should be laughing all the way to the next general election. The only people laughing are satirists who've been handed a political feast for ridicule.
The crumbled Conservatives were swept out by Tony Blair in 1997 and wasted their early years in opposition on their domestic messes. Admittedly Brexit has long been one of those, but by 2005 (9 years on), they had sufficiently sorted themselves into a plausible opposition. New Labour had peaked from a much stronger starting point, but were tainted from Iraq by then. The Gordon Brown years and credit crunch meant that 2005-2010 made the Conservatives look ripe to resume government. I can not see a functional Labour Party looking ripe for government by a 2022 general election under the leadership of Corbyn. Theresa May should have been a gift a competent leader of the opposition.