Then again, I don't find them annoying on tv - so there may be personal bias.
Just be careful of rashly accusing people of "complete cultural ignorance" when it's a really just a benign matter of people wanting to enjoy the football in the way they're accustomed.
There certainly are cases where other factors are more important, but I for one value uniqueness - especially when it comes to differentiating one's self on a global scale.
Originally made out of tin, the vuvuzela became popular in South Africa in the 1990s. http://en.wikipedia.org/wiki/Vuvuzela#Use_outside_football_g...
I remember them being used at cricket & football matches here in Australia in the 80s, till they were banned for being too annoying, just as they should have been in South Africa before this rot set in.
It's not a very "nice" sound (on TV anyway)