"You're merely returning the favor." Jefferson didn't mind it because he knew that Emma needed to feel as though she was doing everything she could for their little group and even the rest of the town. There may have been a grumble here or there when she was really going overboard but most of the time the Hatter took it gracefully as nothing more than Emma being affectionate.
He would rather her care than not at all and if they were to keep their wits in this place, well, he wasn't about to destroy what gave her a peace of mind. He did selfishly enjoy the extra bit of company were he completely honest.
The company was better than the static flashes of the glass encasing and watching beloved Riding Hood be executed before them, powerless to do anything about it. So Jefferson sipped at his tea, occasionally itching at the healing swipe to his cheek and enjoyed Emma's lovely presence and distraction. "Besides, it gives plenty of opportunity for us to make sure you're actually eating as well. No excuses."