The problem is that they never hear about the stuff MAGA folks do. Fox doesn’t report about it, but they blast Biden’s gaffes from the rooftops, meaning more mainstream news orgs have to cover Biden’s gaffes or risk looking like they’re playing favorites. So the MAGAs never hear about the evil stuff Trump says unless they go looking for it–which they only do if they want to hear it from him anyway.
Harris gets to have her cake and eat it too, though; she can say she disagrees to give herself a little bit of distance from Joe in the eyes of the moderate right, and at the same time she gets the press bump on the moderate left from her boss saying it. Honestly, it’s probably going to go well for her.