For fascist and racist I think it comes down to the immigrant bashing, seeming to label swathes of immigrants as rapists, conceding "some of them" are hard working people. Suggesting the families of terrorists be murdered and increasing the use of torture. You hear the story of the black Trump fan who was kicked out of one of his rallies because it was assumed he was heckling?
Bad businessman because he has a string of bankruptcies behind him and people suspect he isnt anywhere near as rich as he says he is. Most of his wealth is built on debt, which was backed by collateral his very rich father handed him. He presents himself as largely self made - self made with a little bit of a head start, like he grew an oak tree out of an acorn - but if that was true he would be happy to show his tax returns. He isnt hiding the fact he doesnt pay his taxes, he admitted that much already, he's hiding the fact that he is nowhere near as rich as he says he - nowhere near as successful as he says he is. He takes out loans and defaults on them or gets other people to pay for his ventures, and there are a whole load of suppliers, like building contractors who have worked on his real estate projects, that say he never paid them.