getting in someone's face = kurang ajar

Always getting in someone's face is the thing the bully learned as a child.

"Selalu bersikap kurang ajar adalah apa yang dipelajari sang jagoan sejak kecil."

The choice is yours of course, Mas Sugeng, based on context.

face (v): 1. to confront, controvert or maintain impudently, brashly, or with excessive assurance: BROWBEAT, BULLY - now usually used with down or out <faced down> <out faced>

bully = a blustering fellow more insolent than courageous: one given to hectoring, browbeatng and threathening; one habitually threatening, harsh or cruel to others weaker or smaller than himself.