Donald Trump to Filmmaker 'You Are a Loser'

9/29/2009 8:39 PM PDT

Donald Trump to Filmmaker -- 'You Are a Loser'

If Donald Trump thinks something sucks, he'll let you know ... just ask the documentary filmmaker who Trump just called "a loser."

That filmmaker is Mike Tollin, who just made a movie about the brief history of the United States Football League. Trump owned a team in the USFL -- the New Jersey Generals -- until 1985 ... when the whole league tanked.

When Mike finished the film, he sent Trump a copy ... along with a letter that said "I'm guessing you won't love all of it, but I hope you appreciate that I've tried to be fair."

Trump sent the letter back to Tollin -- complete with the following a handwritten message on it:

"Mike ... A third rate documentary -- and extremely dishonest (as you know) -- Best Wishes, Donald Trump ...
P.S. You are a loser