Have you ever seen a shy person change into a rude and vulgar one? Of course, if you are constantly bullying or harassing him, his anger might overcome his shyness and might act upon it. But that is temporary. That is not a change. He will always have that shyness. I have seen many impolite people but never once have I come across anyone changing from impoliteness to bashfulness.
I know this person who is the dad of one of my friends. He has this anger that he tries very hard to control. He tries to take things calm and face problems as a civilized and deal with everything reasonably. He is aware of his anger and his wife and children know that he is trying his best to control it. It has been like that as long as the children can remember. But despite all his trying, there were many occasions that he had snapped at his children and wife over simple things.
If you try hard, you can control your emotions to a degree, but you cannot change it.
There are “funny persons”, “rude persons”, “kind persons”, “serious persons”, etc. Have you ever seen any of this kind of a person change from kind to rude or serious to funny? You might see a funny person in a serious mood. But that, again, is temporary. He will always have that funniness in him.
So, if people can change rudeness will also be changed to shyness. Do you really believe that is possible?