I mean your being a bit obtuse if you don't think there was a stigma around criticizing the vaccine in 2021/22.
Writing a LinkedIn/Facebook post about how the vaccine causes heart problems might result in you losing your job and would definitely cause you to lose a few friends. There was a massive stigma around pointing out flaws in vaccines at that time, it was not a nuanced issue, either you were all in or you were a psycho anti-vax nut.
The problem is that if you're criticizing the vaccine for this, you're at best uninformed, and quite often, doing so in bad faith.
As has been pointed out in the thread you're responding to, it causes these effects at lower rates and lower severities than just getting covid while unvaccinated. It's also just something we've known some flu vaccines to do for decades now. (And just the regular old flu can cause it, too)
Writing a LinkedIn/Facebook post about how the vaccine causes heart problems might result in you losing your job and would definitely cause you to lose a few friends. There was a massive stigma around pointing out flaws in vaccines at that time, it was not a nuanced issue, either you were all in or you were a psycho anti-vax nut.