Your predecessor openly refused to criticize you, your administration, and your policies, saying this in March 2009:
He deserves my silence. There’s plenty of critics in the arena. I think it’s time for the ex-president to tap dance off the stage and let the current president have a go at solving the world’s problems.
You are aware of this unwritten rule. Former Presidents are to not criticize, second guess, or undermine the decisions and actions of a sitting President and his administration.
Yet you have been refusing to show the same deference and respect to your successor. Regardless of what you think of any of his policy ideas, you know it is beyond inappropriate for you, as a former President, to levy criticism. Just as it would be equally inappropriate for Bill Clinton, George H.W. or George W. Bush, or Jimmy Carter to levy any criticism against Trump and his policies. Just as it would’ve been inappropriate for any of them to levy criticism against you while you were serving as President.
You were aware even before making the above statement that it is beyond inappropriate. Yet you made it anyway. And you’ve made others before it as well.
Show your successor the same deference and respect your predecessors have shown you. You are no longer the President of the United States. To borrow on the words of your predecessor, it is time for you to exit the stage.
Again your predecessor held his tongue with you. Just as Clinton held his tongue with Bush. And other previous Presidents have held their tongues with their successors. Hold your tongue with your successor. That is the appropriate course.
Yet something tells me you won’t take it. In which case, you’ll show yourself to be due significantly less respect than your predecessors.