Romney took a hit for his 47% remark, Hillary’s deplorables, now Biden’s 15% . Talking bad about your competition is never a good idea, just ends up being fuel for the opposition and their supporters, while any gained ground from the comment is quickly gone.
All Trump does is talk bad about his competition. He just endorsed the only good democrat is a dead democrat.
The high standards for Dems, none at all for cons thing does not fly in 2020.