I like to have side projects, but I still don't like to share them. People love to find reasons to reject, and an 18, 11, or 7 year long side project (the age of all my side projects) isn't really a fair representation of how I code today. Even as someone who enjoys side projects, the prospect of sharing a side project, and being criticized by a potential employer about the contents of it, turns it from "side project…
You should be able to take constructive criticism of your work regardless if it's a side project or not.