Thetis simply raised an eyebrow in reply. "Yes," she agreed. "Your father and I went to Thailand for Christmas. We needed to get away from the cold for a bit. I found some lovely things that made me think of you, though. You should come over for dinner and we can catch up."
Regardless of his stiff, rude behavior, Achilles was still her son, and Thetis was willing to extend him an olive branch. Of course, he might metaphorically set the branch on fire, but she was still going to try.