All he did was ask if you could take it to PM. He didn't say you would be banned if you didn't. It was just a simple request. It's up to you if you want to comply.
Also be aware that buried in your contract is this sentence "You agree not to make any disparaging or otherwise harmful statements regarding the reputation, good will or commercial interests of Maker, its employees and/or talent", so technically, you could be in breach of contract as well.
Forums are also governed by rules and your contract does not give license to break those rules.
Note: I am not parnered with Maker, nor have I ever been.