Answer:
leadership is important in group because as a leader you must show your members what to do so they will not make mistakes
If hes just being rude, honestly just stay in your room or something until he leaves, or maybe even tell your brother about it so maybe he'll say something to the friend. if he keeps bothering you even after all that, just tell him to leave you the FU€K alone. best of luck!!
William shaekespeare wrote thosre