Glad to know I haven’t picked up any seriously bad habits, but how the heck do you keep the chopsticks aligned without tapping them somewhere?
Most of these seem related to health/sanitary practices/being considerate more than anything. Just avoiding contaminating what others are going to eat with your own utensils is an easy way to describe several of them.
You can just slide them with your fingers, even one handed, and it's not like they need to be perfectly aligned.
But, yeah, I tap them to align them all the time, have seen Japanese people do it day in and day out. I've even done it in some fine dining places in Japan. No one yelled at me, but I am a gaijin, so...