aren't we all making this a little bit clinical.. I'm not a member of RPS but I am a member of APS (as an international member that means Australian Photographic Society), that doesn't mean anything other than I am a member.
I just wonder what the harm is in a little support, positive feedback, or constructive critique..
I used to enjoy the 'up' and 'down' critique on DCW, and I think everyone has something to offer, even just to say you like the image. You don't have to have letters, qualifications, awards to your name to be able to support another photographer.