I was watching 'Revelation' and I noticed something interesting
If you look closer at Adrien's lunch tray, you can see something very peculiar included in his meal choices
There's a whole large stack of camembert just sitting there on his tray, just out in the open for his friends to see, and being as how it has been inferred that Adrien doesn't like Camembert, this must be so confusing for them to watch.
Just imagine the bewildered and baffled faces of Marinette, Nino, and Alya as Adrien piles on the cheese onto his platter, only for him not to touch it and then surreptitiously toss it all into his backpack.