this instance appears to be true, according to the cops who arrested the men. it was over a year ago though. Trump's comments at the time were... less than ideal.
even if you ignore the swastikas and racial slogans spray painted here and there anonymously, or the other incidents that rely on the victim's statements alone (ie are uncorroborated by others) there were also the Trump supporters who assaulted protestors at his rallies. that's another half-dozen verified examples of acts committed in Trump's name at least. His supporters also harassed journalists he didn't like at his urging. I think that happened a few times as well.
maybe even more troubling is the way Trump refused to distance himself from support from outright white supremacists like those "alt-right" scumbags and the KKK. I think all reasonable people would be opposed to those groups gaining more acceptance in mainstream American culture and politics, yet Trump flirted with their support throughout the campaign. I think there is a real and obvious danger in their views becoming tolerated by more white Americans than they are already are, and so I am glad people - even celebrities and entertainers - are continuing to speak out against Trump on this issue.