Even though it makes the wake worse, I still try to slow down when encountering a canoer or kayaker. At least they know you respect them. But sometimes I wish they would show equal respect, like not standing in the only spot to go upstream and not getting out of the way. It's tough, but I've only encountered 2 or 3 people in my life that acted like jerks. Most people will act right when giving them the benefit of the doubt.