He was a jerk in person.
Interesting action between Donald Trump and Don Shula.
...
Despite this, one of the few times he came close to leaving Miami came
in the middle of the 1983 season, when Donald Trump, the new owner of
the upstart United States Football League’s New Jersey Generals,
offered him a $5 million contract–a significant increase from the
$400,000 he was earning at the time with the Dolphins. Negotiations
hit a snag when Shula insisted on getting a rent-free apartment at
Trump Tower. When Trump publicly announced the deal was all but
done except for the apartment agreement, Shula broke off talks and
stayed in Miami. Years later, Csonka, by then an executive with the
Jacksonville Bulls, said that he believed Shula would have taken the
job, but was angered at being “thrown out to the press” by Trump.
https://en.wikipedia.org/wiki/Don_Shula