WTF going on - 1

Have you ever thought why speakers(almost all) address the public with a startup "LADIES AND GENTLEMEN" before delivering an ocean of english alphabets permuted and combined artistically.I agree we have to address before speech as per ethics,but my focus is on these two special words used:-"LADIES","GENTLEMEN".Four questions scribbling me on this matter,(1)Is it cause all LADIES,but few MEN are GENTLE??(2)Is it cause all LADIES arrogant and all MEN GENTLE,but using the word arrogant hurts,so only "LADIES'??or (3)Is there any axiom that if you put any adjective before addressing them,they will make a debate on it like if its a positive adjective,they will think this speaker is flattering,hence he doen't have any originality and if the adjective is a negative one,speaker doesn't have any sense of humour,uske maa behen mar gaye kya,this way a fish market will spoil the essence of that speech??...I got fed up ,but hai you(lady/gentleman)
Socha Hai... Yeh Tumne Kya Kabhi
Socha Hai... Ki Hain Yeh Kya Sabhi
Socha Hai... Socha Nahi To Socho Abhi...