Social anxiety disorder is a real condition where a person becomes anxious in social situations. It stems from a phobia of doing something that's humiliating or embarrassing. Shyness is different. Shyness doesn't have the same level of fear and avoidance. Shyness doesn't keep you from being able to function, but it can make it very difficult.
Whether your dad has social anxiety disorder or is just extremely shy, it can make it very hard for him to participate in social activities.
There are ...