You could adopt a set of standing orders, like those reproduced here: https://www.flatchat.com.au/topic/owner-and-proxy-attends-agm-in-person/
And/or you might introduce a by-law governing behaviour at the meetings. If the miscreant breached the by-law, they could then be sent a notice to comply and fined.
In fact, you might make it that if a lot owner or resident has been “named” (as per the Standing orders) and continues to breach them, they will be liable for penalties to be awarded by NCAT for breaches of by-laws.