The comparison between Ange and Conte is a comparison between almost polar opposites in -perceived- leverage and corresponding demeanor. The latter thought that this club was beneath him, and made no secret of it. He assumed that he was doing everyone a big favour by taking this job, and that therefore he held all the cards in this relationship of convenience. His actions reflected these assumptions.
The former is just glad to be here, he knows this is his once-in-a-lifetime opportunity at top level. He'd be crazy to let this slip by throwing a tantrum, no matter how slighted he might be feeling at the moment. He assumes he has no leverage, rightfully so, and his demeanor follows suit. There's hardly anything puzzling here.
Ange is keeping it -mostly- quiet not because he is an exemplary ascetic, but because he knows he can't afford being perceived high maintenance. He might come clean if/when he gets the sack, but until then he'll do his absolute best to avoid rocking the boat. It's a calculated and rational move on his part, can't blame him.