Offense as the best defense

Preemptive strikes. He throws out accusations in anticipation of actions he plans to take so that when he does make his move, the opposition is neutralized by these prior declarations.

Point one - when he lectured the Supreme Court that they had better not rule against Obamacare. That put them on the defensive about appearing to be too politicized and may have caused them to corkscrew a favorable decision by calling the mandate a tax.

Point two - he is now anticipating his extra-legal executive order to keep illegal immigrants from being deported by prefacing the order with complaints that opponents plan to try to impeach him. Again, it puts them on the defensive about trying to invalidate the order, prejudicing the public to interpret their resistance as an effort at impeachment.

Not doing his job

So, he is bored with his job, so say the sycophants proclaiming that his superior intellect prevents him from finding the job a challenge.

I would say he is hiding behind that mask because he does not understand the job and cannot succeed at it. Bluster about how something is not worthy of your attention is often a cover for fear of failure if you try.