The crafty leftists concede that Trump is not himself a racist, but then go on to argue that he sends "dog whistles" to his racist supporters, and therefore is effectively responsible for the normalization of racism in American politics, etc, etc. The reason that this is a crafty tactic is that there is no evidence that Trump is racist. In conceding that point and shifting the focus in a direction that still gives them a victory (by demonizing the Trump voters, and attacking Trump as an exploiter of racism rather than a racist himself, which is just as bad, they can score their points), well, that's quite crafty!
The stupid leftists like Cardkilla simply insist that Trump is a racist. Thusly, making fools of themselves.