At the risk of downvotes, not that I care, there are people out there who are exercising their own due caution for their own health reasons, based on individualized specifics. When has there EVER been a one size fits all solution to health, very rarely.
That being said, I dont have social media and I dont see what you see. From where I sit, I see very little of vocal antivaxxers and significantly of the exact opposite - extremely vocal shaming of anyone who has not taken the vax by people who have.
Many of the people I have spoken to, who have not, have experienced in their lives long-term health effects of ill advised medication - much of it from these very same companies. To demand that they take a new medication that has no longitudinal studies associated with it, along with warnings out there, either from the FDAs own website, or from former workers of these vaccine companies, seems cruel.