There has been bad blood between these cueists for years and it all came to a head after the Masters final which the Rocket won 10-7 to claim a record-extending eighth crown.
Carter, 44, alleges O’Sullivan, 48, violently cleared his nose – like a long-distance runner might do – on to the carpet while sitting in his chair in the final frames of the Ally Pally finale.
The Captain raged: “There were a couple of things that happened out there that go unnoticed.
“Well, they don’t go unnoticed but anyone with an eyesight or a brain can see what’s going on. And it’s disgusting quite frankly.
“No-one wants to say anything, do they? Snotting all over the floor and all that.
“I mean it’s outrageous behaviour from a top professional. If it gets swept under the carpet then for me, it’s not good.
“Did we have any words of exchange? No. I’ve got no words for him at all.”
When this was relayed to the world No1, O’Sullivan personally attacked Carter, stuck up his middle finger in protest and then stormed out of his post-match press conference.
O’Sullivan ranted: “I haven’t spoken to him for 20 years. I played with him when he was a kid and shared a lot of stuff with him.
“For him to come out and try to trash talk me like that, do you know what? He can have one of them.
“He can sit on it as far as I’m concerned. I don’t give a f***. You know what he’s like, everybody knows what he’s like. He’s got issues.
“F***ing why has he got issues with me? I’m not having it. I don’t care, grow some balls.
O’Sullivan has been Carter’s bogeyman for years, having dominated all of their matches bar one defeat at senior level.
Famously, there was THAT shoulder-barge during the 2018 World Snooker Championship second round – a contest Carter won – and the world No10, who has twice fought cancer, gives as good as he gets.