H1B, H4 Visa

i transferred from h4 to f1 while in the usa and within a month of the approval i went for the stamping interview at hyderabad.
The interviewer seemed very curt and rude.
vo: can i have your documents ?
me: yes (i give her)
vo: check on computer and very rudely says .. SO you want to work???? <with a smirk on her face>
me: no mam. my husband has 3 years on his visa , we are the only children of our parents both sides, i want to study and come back.
vo: why this course?
me: i already completed one sem on h4 and i liked the course . its very informative. i got good grades too so i m doing well.
vo: why did u visit xyz countries.. looking at previous visa stamps on my passport.
me: as a tourist. on vacation
vo: how much does your husband earn?
me: xyz
vo: ok you will get an sms in 2-3 for pickup.

i was relieved to know my visa was approved, bcos the interviewer seemed as if she was sure i was applying for visa only to work. but that was not my intention. i wanted to join my professors research group which is why i wanted a conversion. the visa interviewers are pretty vexed at hyderabad maybe bcos many candidates are submitting wrong documents or lie. there was a couple before me and the man was applying for some kind of work visa. he dint know the name of the city in which his employer was. the interviewer was patient and asked thrice. the fourth time she was totally irritated and shouted that he should know that info. so you must be confident and answer with confidence to prove you are not going there to stay back and never come to india. you must clearly state your ties