Last time I took a flu shot was in 1992. The last time I got the flu was in 1992.
I've never taken one, and don't plan to, either, based on stories like yours.
The man and his wife living next door to me went to get their flu shot in late summer 2020, and within days both were diagnosed with Covid. They believed they just picked it up from someone at the clinic. I just listened from across the yard and didn't share with them my first thought, which was wonder what was in those shots.