It's an assumption based on your avatar which gives a "Do I look like a F-ing people person?" impression :D while the images in avatars are for the most part not of the actual member, they do have some effect I'm sure. I've never met Robert (Robbiegong) either, but I imagine him looking rather like Bob Marley. My avatar is a blank space, which sums me up perfectly.
Maybe this is just the way my head is wired - similarly, when I read posts, the voice in my head is my own, as I don't know what they sound like. When I recently spoke to Marco I was surprised to hear a Scottish accent although really I knew it would be. I thought he might sound a bit more like Duncan Norville. :)