For the serious pedant about flags:
https://www.flagaustnat.asn.au/protocol.php
This confirms the illumination at night. Presumably that could be arranged to shine into the bedroom of the nationalist neighbour!
Flying the flag upside down is a distress signal. Perhaps that could be arranged by those who are distressed.
International usage forbids the display of the flag of one nation above that of another in time of peace. Perhaps your building could call a general meeting to declare war on someone!
Have a flag design competition so you can fly the flag of your owners corporation along side the Australian flag.
Those are my suggestions.
More seriously, I always suspect crass rightwingedness in flag wavers but that is my prejudice.