I sympathize with you about this topic. Here is the official rule for artificial noise makers....
Noisemakers are allowed at outdoor events as long as the officials do not determine that they are being used to taunt the other team or their fans.
B.Childress of TSSAA
The problem I saw was that the horns not only impacted Riverdale's game, it also impacted games on the other fields. I understand fan enthusiasm, I had quite a bit during my visit to the 'Boro. But, if I felt for one second that it was a distraction to another game, I would clam up. But, that's my opinion. You know what they say about opinions.