Vibe reports that the claims were leaked from Raz B's upcoming memoir This Boys Life.
Best known as a member of the group B2K, Raz B 'outs' several hip-hop and R&B stars in the book, including Bow Wow, Lil Wayne, Ray J and Omarion.
He apparently wrote of Brown: "I've never had issues with substances; even when I was at my lowest. I always thank God I never had a serious addiction like the Weezy's [Lil Wayne] and the Breezy's [Chris Brown]."
The former singer added: "What type of man hits a woman? A man that does not honour womanhood or the fragility of it. I also read that most men who beat women have latent homosexual tendencies. So there you go."
Brown later took to his Twitter account to refute Raz B's claims, saying: "Lying about somebody in a book is called defamation of character. Keep feeding people bulls**t and ima end up owning you and that book! RAZ B! God bless... My lawyers are handling it! Lol ima chill!"
Brown later deleted the tweets, but they had already been retweeted and screencapped by fans.
The controversy comes just weeks before the launch of Brown's upcoming album Fortune.
This Boys Life is due for a September release.