A recently published book by a former Boomtown Rats backing singer Zara H Phillips details an incident in which Geldof defended her against an abusive admirer by attacking the fan halfway through a gig and leaving him with a broken nose. She says, "He kicked him once or twice, and blood came spurting out of the man's nose. He collapsed and other members of the crowd started attacking him, and a big fight started".
I don't think she's being accusatory about it. There's a nice quote about the book from Geldof on the top of her website.