When Thranduil read in the Hobbit that burgling his halls was “the most boring part of the adventure” for Bilbo, he must have been incensed! His halls are beautiful, filled with food, wine, and merriment! There was so much to steal! How could Bilbo not appreciate it? Rude!
The best part of this is picturing Thranduil getting cozy by the fireplace with a glass of wine and cracking open The Red Book of Westmarch only because he wants to read about himself, and after eight uninterrupted chapters of Not Him the silence is broken by his enraged gasp.