Silliness is often seen positively in friendly contexts as a sign of humor and relaxation. His silliness at the party made him the center of attention.
Pro Tip 2/3
Not Insulting
While 'silliness' implies foolishness, it's usually not used to seriously insult someone. She apologized for her silliness yesterday, but everyone had already forgotten.
Pro Tip 3/3
Social Situations
Silliness can disarm awkward situations, making it a social tool in casual settings. After the awkward silence, his silliness broke the ice.