if they didn't want people coming up to them when they were out they wouldn't post where they are on twitter/instagram
I noticed when in Sydney Tully & Drew would post that they were having lunch somewhere but usually posted once they were almost ready to leave judging by the posts from people who missed them by 5 minutes ... so they were being clever about it at that stage
so long as people are respectful and not getting in their face I think they would all be ok at this point with saying hi and taking photos ...
but if they started following them to their homes etc - well THEN its creepy and needs to stop
not sure if Reaper was meaning people were outside at Noosa or in Melbourne ... I'd think it would be more intrusive to disturb the Noosa one than the large group of HM's at the pub ... but again so long as people are ok with standing back and waiting and don't get too intrusive really they shouldn't complain too much ... without the fans maintaining interest in them their time would be up ...they need to keep stoking the fires