I would have the same reaction to air horns in the convention hall or at the concert. The idiots at the concert did stop blowing the horn and leave when people *glared* at them. My look was more along the lines of what I look like when I see puppies being kicked.

While I can sort of go with vuvuzelas being ok in the right situation, I can't think of many that they'd be "right". Even at the soccer games I kept hearing about how important the team songs are, and that the vuvuzelas totally ruined that.