It's not a familiar trait at all. In fact, it throws Jay off and leaves in perfect speechless for just long enough to be noticeable. When they were together ("together") in Japan, Jay often made suggestions, but Seung was usually the one making the decisions and otherwise being in control of the situation. He was so taken with Seung that he was fine doing whatever he wanted to do. Looking back on it now, he's not quite as fine with having allowed himself to be lead around like a puppy.

Jay sits back in his seat with his arms folded across his chest and looks off to the side as he ponders what it is they should do. Also to make it seem as though his stunned silence is merely part of him considering the suggestion. "Yeah, okay. Let's go family-style."

Allowed to make his own decision and he just ends up going with Seung's suggestion anyway.