The reason we don't like the word "Farsi" I believe is: the actual word is Parsi and in Arabic language "p" doesn't exist so when Islamic Arabs attacked Iran and stayed for along time cuz they couldn't pronounce "P" they were saying Farsi instead of Parsi so after few hundred years of occupying Iran b4 they got kicked out, the word of Farsi stayed I hope the F word goes back to them to have fun with it