I (also Dutch) also have never heard about this practice of using your right hand to open the left door. It's an interesting idea, but certainly not common prac

I (also Dutch) also have never heard about this practice of using your right hand to open the left door. It's an interesting idea, but certainly not common practice. I have never in my entire life seen anyone open their door like that. People just know that you must start looking backwards first and then open the door slowly.