It's all down to the media having to put a label on everything/everyone. We had a thread like this before, and I think I came up with The Spice Girls as an example. They didn't come up with those names, the press did.
I thought of George being the quiet Beatle because that was often the case when I was with them over the years from the days at the art college, through the Jacaranda gigs, the local gigs, the tours, TV and radio appearances etc.