Ted hums thoughtfully. It doesn't exactly surprise him, given some of Sherlock's comments towards Ted, but it does sadden him to think of him treating Joan like that. And for Sherlock to narrow his view that much.

"Well, I can definitely see why you wouldn't want to be naked in front of him then," he answers, even though he empathizes with what Sherlock was dealing with. It's understandable, but definitely not healthy, for neither him nor the people he interacted with.