Speaking moments before Tomic Sr was to face a Madrid court last night, Drouet told the Herald Sun he had been treated like a "dog" and a "piece of s---" by Tomic Sr for months.
He said things came to a head after Tomic Sr demanded Drouet buy him a carton of milk as they were waiting to go to the airport.
He said he replied that he didn't have time.
Tensions were already high, he said. He said he saw Tomic Sr punch Bernard in the mouth during a practice session last Tuesday, leaving the player in tears.
Drouet said outside the Madrid hotel Tomic Sr asked him to walk with him.
"After 100m or something like this he was looking around and then he started again. I thought he was going to say sorry for the verbal abuse, but no.
"He spat in my face
, then walked away, and said he wouldn't pay me any more.
"I said, 'OK, John, you are a real man. That's fine. Bernard will pay me'.
"And he headbutted me.
"Every day he treat me like a dog for six months, with disrespect and then this. But he need to be off the ATP (tour)."
"Tomic Sr, a highly volatile and controversial figure on the world circuit, faces a possible lifetime ban from tournaments worldwide if found guilty of assault."
This could finally pave the way from Tomic to get away from his dad.
His dad denies it and claims it was self-defence. Yeah, right.