He doesn't hold back on the people saying mean things about him, that's for sure!
You may have noticed Robert De Niro featured in the Oscars edition of Mean Tweets, alongside the likes of Natalie Portman, Ryan Gosling and Emma Stone.
However, the producers of Jimmy Kimmel Live, according to the video description, thought De Niro was so funny on his own that they compiled the best of his Mean Tweets for it's own segment.
And yes, it is Robert De Niro at his very best:
