I don't know if I can make a generalized statement about what's "normal" and what's not, but the fact that you're asking makes me think that maybe you're uncomfortable with your T's level of affection? Regardless of what's normal or not, your T shouldn't be doing anything that makes you uncomfortable.

Has your T actually admitted to "choosing favorites" or told you you're a "favorite" client? For me, that raises a red flag.