HOW TO BE DANGEROUS

Never respond immediately: wait a few seconds and do it cold and concise, this will give you sometime to think and give the answer on logic not on emotions

Walk with your shoulders back and maintain good posture. here you will seen as confident person and be given the same treatment 

walk up right 

Never ask or beg if you are not invited or included if they didn't see your importance don't give them your attention 

Accept what is outside your control you cannot control everything in your life admit on some issues since they cannot destroy nothing in your live