Visitor Visa - B2

Yesterday I had an interview in USA Embassy Karachi, It was my 3rd time.I chosen URDU language for interview .Strange thing was that VO asked me all the questions in english.so i had to speak english,

I stand in front of 2 mins infront of visa officer, he was typing on his computer,at that time he did not take my passpost nor said any thing, after 2 mins for typing he took my passport,asked for figure print.No hello hi , no greeting nothing,and the first question he asked
VO.What do u have to show me?
ME.I gave him my sister invitation letter ,and i said i want to meet her and rest of the family, she is working in unversity as professor,he read the letter,then

VO, So what u r doing here
ME. told about the job,
VO.Do u have a rented house
ME.No i own a house which my mother left for me.
VO.how u pay ur expenses
ME,I have job pluse i have good saving and give him my own bank statment,he looked in detail.
i also said that i recently visit UK to meet my brother,
VO.What he is doing there
ME He is also a professor in university.
then he gave me my passport and 214 b ,and said i cant give u visa right now .
i asked why sir, I have good traveling history,I visited UK Twice, dubai , saudia, and never spent more then one month in any country .I have my own house ,good bank balance .
VO gave strange anwser ,he said as per computer u r not eligible right now.
i said ok and left.
please any one guide me about the last anwser, he gave me, why he took my interview in english with no greeting not asked why u want to go usa, just asked what do u have to show me,and what would be the main reason of rejection ,any one can guide me.
Good part is that families and older people are getting visa atleast in karachi embassy,