Have Australian Law Questions? Ask a Lawyer Now.
Making derogatory comments or infalmatory coments about people on the basis of the sexual preferences is a breach of anti discrimination law and can result in fines or an order that you ay compensation.
Stealing someone's identiy could amount to an offence if actually represented yourself as a particular person, but would not amount to an offence if you simply used a pseudonym that happened to be confused with some other person.
However if you have deliberately impersinated another and then used that stolen identity to vilify others due to their sexual preferences you may also potentially be exposed to defamation proceedings if your actions have damaged the person whose identiy you have misused.
Although all these possibilities should be taken seriously and you should be very wary of repeating such behavior, they are also likely not of such a serious nature that the authorities will expend a great deal of resources trying to track you down, though it is a possibility.
I appreciate this is not the answer you may have been hoping for but it does reflect the reality of your situation.
Good luck and PLEASE RATE MY ANSWER.