I do that too. My son watched me for years and is able to snatch them out of the air.
He was having a discussion with his friends and did it whilst talking to them and one of them stopped him and said that was Bad Ass!
He goes "What? I do that all the time."
You and your son truly are Bad Ass. I trap flies under a cup. Slide a piece of cardboard under the cup and take that outside to let them go. I am compulsively worried about the life of small things. You are Bad Ass.