The problem with using clinical phrases to describe normal behavior is demonstrated in this post. "Social anxiety" has a specific clinical meaning that is not covered by this post. The post is actually discussing a very natural and rational nervousness that normal people have in social situations. The post is providing a way of thinking about that nervousness that can help reduce it, for the nervous person's benefit, and it's great if that works, but it's not addressing social anxiety.
Social anxiety is a condition that cannot be thought away, you cannot rationalize social anxiety nor can it be represented as a cost/benefit analysis of risk of being disliked vs. reward of being liked. You can feel socially anxious without having social anxiety. You can be depressed without having depression. You will be depressed after your beloved pet dies. You will be socially anxious walking into a room full of people you haven't met before.
Social anxiety is a condition that cannot be thought away, you cannot rationalize social anxiety nor can it be represented as a cost/benefit analysis of risk of being disliked vs. reward of being liked. You can feel socially anxious without having social anxiety. You can be depressed without having depression. You will be depressed after your beloved pet dies. You will be socially anxious walking into a room full of people you haven't met before.