Main point in this discussion, as Rounin already said; "mIRC isn't managing chat rooms".

There is nothing 'hosted on this chat client', there is nothing we can do to stop people from mis-behaving. Please do some more reading, try the IRC Intro for a start. Also the information about conflicts on IRC might help you to get things right.

Of course we will try to help you when you have additional questions, but not in this thread.