Telling people to "smile" and/or "laugh" is not, in fact, nice.
Telling people how to behave is an assertion of ownership; it is disdainful of individual agency, a failure to acknowledge boundaries and autonomy.
That auditing other people's emotions could be considered "nice" is absurd. But par for the course in a culture that is contemptuous of consent.
[H/T to Shaker Sophiefair.]