According to TN, one Duncan Stroud from New York who escaped to Argentina back in 2006, says De Niro is a horrible person and a bully.
Long story short, Stroud and his partner registered the domain, tribeca.net in 2004 a few years after De Niro had launched the Tribeca Film Festival in 2002 following the 9/11 disaster.
Both Stroud and his partner were sued by De Niro's army of lawyers, the latter dying from a heart attack, the former ending up bankrupt and with heart problems, subsequently fleeing the US for Argentina in 2006 (paid for using a credit card he could never pay back) because he was facing prison time for non payment of alimony to his ex-wife. His US passport was also rescinded.
He first lived in a crappy bedsit in Constitucion, ended up homeless with heart problems, met an altruistic woman who helped him get legal and thence an operation for stents in his heart and by sheer coincidence, an old mate of his from New York offered him some unspecified work from his office in BA.
Stroud says of De Nero:
QuoteDe Niro is a greedy narcissist, a horrible person, a miserable control freak with zero personality. I know him personally: zero personality. During our trial, we met a lot of other companies and ventures that had been taken to court by him just because they used the Tribeca name. And you can't beat him. For that you would need a Donald Trump-level legal force. But time passed: on a human scale, I curse him because he's a horrible guy, but on a cosmic scale, I thank him. Thanks to him I'm here, and I'm not leaving.
Incidentally, the domain tribeca.net is for sale at around US$34,000 which begs the question, why did De Niro not snap it up?
It's a fascinating story and I'd like to find out more...
EDIT
He's written an autobiography about this and living with autism.
https://www.amazon.co.uk/Legally-Blind-Duncan-Stroud/dp/1537461540