As others have said, it is kind of understandable that he's pissed off if the club promised him x, y and z - and then failed to deliver.
It's just that the whole thing is so ridiculous to begin with that it's hard to sympathize: yeah, sign here and we'll make you the first player/DOF in history, plus give you an insane salary, plus get rid of that pesky Neymar (so that he won't outshine you), plus replace the Eiffel tower with a statue of you pissing on the world (in the style of Manneken Pis), etc.