McClean, who held talks with Oâ€™Neill on Friday faces hefty fines from his club if he uses language to incite further problems.
Oâ€™Neill said: "Is he maturing? No. He has gone back on Twitter, even against advice of the club. I have to say maybe he will look out for himself then.
"I am learning these things all the time, such as from my daughters. I have no major problem with people going on these things but what they donâ€™t seem to realise is that when they go out there it goes into the public domain.
"As long as he doesnâ€™t start to talk about the football club and use derogatory comments, then fine, and as long as he doesnâ€™t swear.
"These are the things I would take exception to. You might say it is the kettle calling the pot black, I know. I am not so sure what we can do. I will have to really have a look at it and see. Has he learned? We will see. I am allowing it to settle down."
He added: "Do I expect to get a tweet calling me a clown? I wouldnâ€™t be surprised. I dare him to do it."