No, it wasn’t, obviously. What a disgusting thing to say.
It is indeed a disgusting thing to be true.
Easy, just look at who is in favour of censorship, "deplatforming", violence against people with the "wrong" opinions. Words don't hurt, Tweets are overrated. But silencing people, causing them to lose their jobs, or just assaulting them, that hurts.
I don't believe it's the case that Biden or anyone in the leadership of the Democratic party has advocated for violence against people with wrong opinions, or indeed anyone.
He explicitly said there are good people on both sides.
The thing people are upset about is that Trump walked the line between condemnation and support.
I think you're right that people were upset with Trump for focusing on that and drawing a moral equivalence between the counter-protestors and even those willing to march with white supremacists. One could even reasonably argue that no 'good' person would choose to join a march largely inhabited by white supremacists, or even that their support of the General Lee statue was itself a racist act. But those are the points that should have been made, rather than stretching it to say Trump literally called white supremacists good people, which he didn't. There's plenty you could criticise without resorting to taking him out of context.