We don't have anywhere near that much of a grasshopper issue in northern IL. Do they swarm up like that every year there, or is it just a fluke because of your weather or something else? With that much of a pest problem I can see why it would be tempting to spray a whole farm & fleets worth of Sevin, but I have to agree with bakerboy, you have to expect that any pesticides you spray will have some impact on your bees, directly or indirectly. Esp. 200 gallons worth. Not saying your neighbor didnt have a big part of your bees' problems this year, but Sevin is tough stuff.
And if pesticide use in my area was enough to make my lips burn and eyes water, I would really think about complaining or relocating.