QPR boss Harry Redknapp was last week forced to deny reports that his squad treated a warm-weather training camp in Dubai like a stag-do.
O'Neill said: "It was a big win for them coming on the back of all those stories.
"We trained every single day ourselves in Dubai and QPR trained pretty close to us one day.
"If you win the game, doing the conga outside somebody's hotel room would be taken as normal behaviour - if you lose the game, it would be reprehensible!
Asked whether drinking together as a squad could be beneficial, the Black Cats boss admitted: "As long as you're not over-playing it, there's an element of that.
"Regardless of all the changes made in the modern game, I still believe that it exists.
"But the modern day player would have a better idea of how to look after himself than 20-odd years ago.
"In our day, when we were winning, Brian Clough would remind us at times that he was getting calls from the public to say we'd been seen out drinking.
"He wanted to know who DIDN'T go out so he could fine them!"