Ugh, what is it with asians and gross eating anyway? I use to work at a fish market years ago and I use to deliver fish to all these restuarants, and the Japanese/Chinese/Korean ones would always want fish heads as well, the stuff we use to throw out. I couldn`t understand why until one afternoon I pulled into the back of this one place and they were on a lunch break eating the heads RAW! Ewwwwwwwww! One guy even told me he likes the eyes. Ewww ewwww! That`s like eating snot!
Many Asians feel the same way about fermented milk. It's what you are used to. One man's delicacy is another man's garbage.
Besides, raw fish heads are relatively tame. Try balut and then we'll talk.
It's not just Asians. Scandinavians can be pretty bad, what with "lutefisk" (fish soaked in lye) and there's some sort of Icelandic delicacy that involves burying a large ray in the sand at the beach, letting it rot, and then eating it, I believe.