Loki considered 'satisfactory and acceptable' to be neutral enough, and it was the only word his mind could seize hold of in this situation that wouldn't seem inflammatory. That's why he looked thoroughly perplexed and more than a little wounded at Sif's open admonishment, and whatever Darcy might say or do next. It was hard to tell, because Darcy was as chaotic as he was.
He quickly downed what Sam gave him and fetched the homemade liquor, pouring himself some more.
It seemed he was going to spend time attempting to make amends on two fronts, rather than enjoying the festivities. He might as well start with the host.
"I do apologize?" he explained to Sam. "We've a past history that is filled with some contention. Unfortunately that is more due to my transgressions. As I'm certain you know well of, given past circumstances."