I think a lot of people are saying he doesn't trust the process.
Maybe.
But to me, being a little bit of a headcase/diva/what-have-you is not determinative of whether or not a given player trusts the process. I think it has more to do with whether or not that player is willing to buy in, be a professional, and put in the work.
My point is that, while less likely, I think it is still possible that a player can have off-the-field issues, but still be considered process-worthy because they show their willingness to put in the work. See, Zay Jones.
Not sure if that is Beckham or not, but a guy who wants to be the best WR in the game must put in some decent work.