You can't really compare Joe Biden to John Kerry lol.
Neither can we compare Bush to Trump.
There's only so many elections to compare this one to, but when in every election during the past 16 years the Democrats have gotten 20-25% of the White vote, 30% is ambitious, let alone 36%. Of course Obama and Abrams were not White and Clinton was extremely hated in rural America, but John Kerry, who did decently well with Blue Dog Southern Democrats as a whole, got 23%. Kerry may have had a reputation as a 'Massachusetts Liberal' toxic to middle America, but in reality he kept AR and MO under 10 points and won the ancestral Dem counties in KY and WY quite handily. Carter and Nunn, too, got around 23% despite having historic family names that surely would have made them more palatable to GA Whites.