Yes its nice to be friendly but as latitude said,, which ive encountered before,, the "Diver that knows it all". Sadly in a small way i laugh at their ways, i had a diver next to me he was over weighted, struggling, over kicking, I said "Hey man why dont you try droppin some lead"? his response " I have over 60 dives i know what im doin" yep he knew he wanted to be an anchor instead of a diver. it seems that some not all of this isnt always instructors faults, its when the newbee starts cutting corners resulting in "My Way" and now they have thier c card and is a divers diver now! typically when im with or near a diver of this attitude ill keep them at or around a 11 or 2 O’clock postion from me, to keep them in my sights and theres less of a chance ill get swarmed in their silt cloud and incase of an emergency with them!