A: Don't put on airs. Do something practical.
B: Sir. I... I dare not next time.
put on airs
Put on airs的字面意思是“把......放到空中”，引申为“装腔作势，摆架子，盛气凌人”的意思。
I didn't like to put on airs, and even less to have too many people catering to me.
She put on airs after marrying a millionaire.
You shouldn't put on airs even if you were in charge.