Depending on the condo documents recorded at the county court house , there may be common areas shared by all and ( second ) limited common areas not shared ( decks, patios, stairs ? ).
Limited areas might allow for private furniture, flags, etc.
In any event, individuals should have some common area rights : swimming in the pool, using other common facilities.
State law apparently forces the elected Board of Directors to follow state law ( even if they do not want to allow the flag ).
See post 3. Florida law apparently states that the Association was wrong. Hope this guy goes after them!