Billy Rhythm said
Being "mean" is something different than, as I said, "poking a little fun". There are better examples of The Stones being "mean", such as the song 'No Expectations' (chalk that as another example of The Stones doing some Blues), where the lyrics are directed towards Brian Jones who at the time was struggling immensely with extreme addiction problems and his days as a member of the group were clearly numbered:
Once I was a rich man
But now I am so poor
Ouch! Talk about kicking someone when they're down, not that Brian didn't need a good kick, but yikes!
Billy ...