It's not that these people actively care about social media or anything, it's just a regular part of life. I'm like OP here in the sense that I don't have any active social media attached to my name but I have some token pseudonymous social media accounts for exactly this reason. Being this obstinate about it is legitimately a huge red flag, and imo indicates that you've given up even more control of your life to social media, rather than understanding how to use it as a tool for a set of narrowly defined tasks.