Eugene, first I would like to commend you for trying to show some courtesy. The challenge is simply this.
There are 2 user groups looking for a completely different exp on the water. The sled is fishing and hears his motor all day so thinks nothing of it. A DB is also fishing but looking for some peace and quiet hearing nothing but the dip of the oars in the water.
So when a sled comes motoring through its kinda like riding a motorcycle through church.
Is there a good answer? No. It could be dealt with "Forks style" where they cut up your trailer with a torch. That seems to have worked very well up on the OP. But that isn't the answer here.
Just remember that they yell because you are kinda ruining there exp that day. Thats all.
I will offer you this. If you would like to know what its like, invite some friends or family over for dinner. Then I will come and ride my MX bike around your house for a few hours. I then think you would understand.

Again, thanks for showing some courtesy. Many people don't.