Flooding for social anxiety is a bit of a miss and hit affair because of self-consciousness and safety behaviours. Self-consciousness keeps the problem going because information will be biased toward negative appraisals of the self and others. Safety behaviours keep the problem going also because you do certain things to help ward off potential embarrassment and humiliation. Without those behaviours you feel threatened while with them you feel more secure. You might drink alcohol before an event. You might always stand near the back of the room behind everyone. You will never learn to see that these threats are really imagined or exaggerated if you don't allow yourself to behave differently andm ove out of your comfort zone. Therefore the problem of shyness and social anxiety remain when these 2 things are intact. Remove them and flooding has a better chance to work.