We get sternly commanded (by 30-month-old DS) not only to stop talking, but "Stop talking -- watch Simon!" We also get ordered to "Stop singing!" and it's not for lack of talent (in DH's case, anyway -- he's a musician and excellent singer!).
Interventions also occur when DH and I try to hug or snuggle, though thankfully this is making a happy transition to DS just wanting to join in, rather than his coming between us and demanding that DH go hug the dog instead!
I've been assuming it's normal two-year old stuff, but I'm all ears if this means something more sinister!