I think an aggressive snake has to get use to the person its being held by before its tame with that single person. But once that single person passes the snakes onto another person the snake is going to be aggressive again in tell the snake recognizes that person by scent. And then I think there can be tame snakes that are tame with everyone no matter scent. I guess it all depends on if your snake is use to being held frequently or not. Also if a snake is abused by humans I believe it will always be aggressive tbh.