Jeffrey Katzenberg, who was the chairman of Walt Disney Studios from 1984 to 1994, thinks Donald Trump is not a good candidate for president. “I’ve known Donald Trump for 50 years,” Katzenberg told a West Hollywood crowd on Sunday, May 5, of meeting Donald and his father in the ’70s. “The only thing I can say is he was a colossal a—— then and nothing has really changed.” Katzenberg went on to call Trump, 77, a “catastrophe on a level that I don’t think people have fully paid attention to,” adding that he always says “what he’s thinking and what he is going to do.” The media mogul also cite…