The thing about the media did Bernie dirty narrrative is that, is that the media had left Joe for dead leading up to NH and IA, and then was burying him in a shallow grave in the backyard afterwards. Sure they acknowledged he would win SC, but no one expected the margins. Except people that were paying attack.
Negative media coverage of Biden =/= Negative Media Coverage of Bernie, nor was the Positive Media Coverage of Biden = "Positive Coverage of Sanders." Biden got the "We're disappointed he's not performing well and it looks like other candidates might be the moderate to run with" versus being compared to Nazis, Coronavirus, and fearmongering about every single facet of his candidacy. Even when Biden was doing poorly, he wasn't being ignored like Bernie was when he was doing well.
This is only true if you cherry pick the worst of Biden's record and amplify it over the internet.
It's more than Cherry Picking when it comes to Biden. His record is just all over the place and blatantly awful in some areas, with changes only happening when things became politically convenient for him in some places.
Beyond both of you, the point is people were undecided and it's not like they rejected Bernie outright, they just accepted Biden's "electability" at the last minute. People want to endlessly complain Sanders turned off voters with his platform and was too antagonistic and that cost him voters, but a massive portion of the voting base didn't give a shit because they just wanted someone who could beat Trump and the narrative around Biden became compelling enough to sway them through various endorsements and wall to wall media coverage. They would have absolutely voted for Bernie if he had done better in South Carolina because they weren't opposed to him, they were opposed to Trump specifically. The increased voter turnout is not excitement for Joe Biden, it's anger at Trump. Sure, Bernie didn't make the in roads he absolutely could have in some places and that hurt him, but he wasn't some massively unpopular candidate versus the incredible popularity of Biden. There's just so much more to this primary that people throw out the window to try to punch down on Bernie every single time and elevate Biden.