The Proud Boys are violent pieces of shit who regularly spout racist, hateful rhetoric. That they're willing to admit non-white members and don't like to call themselves white supremacists doesn't change that. They should have been a very easy condemnation, and they would have been for literally any other mainstream politician. Trump's first instinct when faced with his racist fanbase is always to let them know that he's on their side, or at least to not alienate them by making it clear that he isn't on their side. It's only some time later, presumably after every single one of his advisors tells him that it would be political suicide not to condemn these people, that the requisite disavowals of hatred and violence come. (There may be a condemnation of the Proud Boys coming at some point in the near future, depending on the backlash. We'll see.) Now, I don't necessarily think that someone's intuition is always indicative of their morality, but at least in this case, I think it's telling that when put on the spot and left to his own devices, Trump instinctively chooses to pander to the more repugnant corners of his fanbase and cultivate their support rather than make a stand against their horrible beliefs and actions.