i totally agree, i had this for years at school and it never ends,
i just started a new job and so i have had everyone asking me
"so...what music do you like" to which i reply
"like american indipendant stuff"
then they usually say
"oh like rock music, like the red hot chilli peppers?"
then i would say
"umm they're ok, but i like bands like ummm sonic youth and elliott smith and the flaming lips"
and they say
"sonic youth?, who are they?, Elliott who?, oh the flaming lips, i hate that song they do y'know the new one"
then i walk away.