Honestly, I'm not even sure where to begin answering that question because there is so much.
I think if I had to sum it up in one general term, its hypocrisy.
-They claim to be freedom fighters, but they want to censor everybody and force everyone to follow their rules.
-They call those they dislike Nazis, even though they are the modern day book burners and try to silence and censor everything they disagree with.
-They claim to be the rebels, but then want us to fully submit to the will of the state and do what we're told in all scenarios.
-They say they want to question and critique everything, but don't like it when that critical eye is turned on them.
-They call people they don't like racists, but then express open hatred for whites and will call PoCs that don't fall in line the most racist shit I've ever heard in my life. (Case in point, apparently Cubans are just dirty whites now)
-They claim the 2016 election was stolen and went on and on about it for 4 years and even got their investigation, but when the 2020 election had some discrepancies in the data, they wanted everyone to shut up and just accept it.
-They claim they want to elevate marginalized people, but then don't want them to be held to the same high standard (meaning, its okay to call a Michael Bay movie a pile of shit every which way till Sunday, and women and PoCs should get the same opportunities he does, but DONT YOU DARE mock that Ghostbusters movie!)
-They claim they want peace, but then speak with violent rhetoric and wish death on people they dislike (and the more violent ones take it even further than that).
It all boils down to hypocrisy. If the left wasn't full of insufferable hypocrites, they'd have no movement. Not saying the right doesn't have any hypocrites (I'm an Independent by the way) but what the left has turned into is just a 3 ring circus, and the politicians and all of media have gone out of their way to pander to this group of vocal whack jobs who are either assholes, completely insane, or both.