I agree that Duncan early in his career was much less of a cry baby. And yeah, Timmy today is a ing cry baby and there is no way around it.
I don't think it had anything to do with Robinson, however. I think Timmy got a rep of being stoic and complained a few times and got tangible results. He saw that it worked and kept using it.
Its pretty crazy how when Duncan came into the league he was known as one of the less emotional players in the game - I remember articles about stoicism in reference to him - and now he's known as a cry baby. Its detracted from his game, IMO.