Speaking of "complete cultural ignorance", you might want to do a little research into South Africa's long, splendid history of singing at public events, which at the football at least, the vuvuzela has largely destroyed.
Then again, I don't find them annoying on tv - so there may be personal bias.
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.
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.