I can't back anything up with sources but here is my take:The Putin fan boys/MAGA don't like Zelensky because he has exposed their hardman Putin and embarrassed him. He's shown what was considered to be a sophisticated war machine with strong soldiers to be a pack of useless drunks, and other people to run.
For god sake they're importing soldiers from North Korea. It will take 10+ years to build the Russian army back up again.
Russia has yet to commit their best troops. The lesser troops they have been using are now battle hardened and experienced. Russia's old outdated equipment has been upgraded and recycled and is now fully restored and effective. In the time Ukraine has been fighting Russia has learnt how to destroy every tank that the rest of the world can bring against them. Russia has perfected drone warfare and is continuing to improve anti-drone tactics as they emerge. Every time the Ukraine has 'broken through' the lines they have found themselves boxed into mined, targetted space with strong Russian lines on either side. The Ukraine and US continue to parade their proudest moments and best equipment on the internet, allowing Russia to identify targets and reverse engineer or protect against attacks. If Ukraine had folded quickly, there would have been a lot of population 'behind Russian lines' with an axe to grind for generations - the longer the war goes on the less Ukranians there are in residence heading into the future.
I don't think Putin is being exposed and Russia embarrassed in any way that they have not setup themselves.