Blowing your air horn when leaving. What do you want man?

Have only seen (heard) that at one RV park we go to in Colorado. Many people stay for days/weeks and have made many friends there. There is a climb up a long grade on the highway above the park when leaving. And it is common for people to honk their horns going up the grade to say goodbye. Doesn't bother me in the least. If that is my worst worry I am doing pretty good. :B