Cash said he was embarrassed at the crowd's baiting of the French seed and warned there could be a repeat of the tournament's infamous crowd violence.
"The crowd were absolutely going crazy. Actually I'd say out of control," Australia's Cash told Fox Sports, referring to the five-set marathon on Thursday.
"I thought the umpire didn't handle that at all ... It was a joke.
"Paire would throw the ball up and they'd go 'Miss it!', stuff like this. It was out of control."
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"A fair amount of the crowd had no respect whatsoever for a seeded French player, absolutely no respect.
"I was quite embarrassed and I think the officials need to do something about it."
Fan violence has marred previous editions of the Australian Open, and Cash said there could have been a repeat if any French fans had taken exception.
"It got out of hand a few years ago with the Greeks and the Croatians having fights, I don't want to get into who started what but if there was French people there they could have been really upset about what was going on," he said.