I'm not talking about people who had a "cure" but about those who shared their experiences openly while being censored and dismissed. People who are not part of a campaign.

You're assuming you can tell when a stranger on the internet is part of a campaign or mistakenly parroting something from a campaign. The internet is heavily astroturfed, especially social media. Several hugely popular pieces of misinformation have been traced back to just a handful of accounts that look like and pose as regular people but, upon thorough inspection, are very clearly lying either for money or for propaganda. Those accounts lied, not got it wrong, lied, and millions of people parroted it. Many of them lied a bit themselves and framed it as something that totally happened to someone they directly know.

You assume a lot, and the way you associate everything with anti-vaxxers only shows how much governments have turned this into a political issue.

...Motherfucker, it's not a politics issue, it's a science issue. Antivaxxers have REPEATEDLY shown they don't know what the fuck they're talking about. At best, they're scared of what they don't understand and make mistakes. At worst, they're grifting at the expense of people's health. Many just want to feel smart, like they're in on a secret the rest of society can't recognize, and they're willing to endanger people's health and wellbeing to get that feeling. In no case are they overall correct, even if they manage to occasionally brush against truth as they flounder. You wanted examples of why regular people might go on the internet and lie about the vaccines, and antivaxxers are a great example because everything that comes out of their mouths on that topic is either half baked or, relevant to the question at hand, an outright lie. Some of them will just make up random shit on the fly to defend their incorrect beliefs. Shit, some people are just pathological liars, and some portion of them will be antivax or whatever.

If I say someone close to me had side effects after the vaccine, suddenly I'm assumed to also drink bleach and take dewormers.

I don't think anyone with sense and information doubts that people experienced side effects. When I got my COVID vaccines, we had to wait a little while on site in case we had an allergic reaction or any other sort of adverse reaction. What most of the doubters don't believe is the people suggesting it's way more dangerous than anyone thought because the vast majority of the evidence is someone claiming that their cousin's uncle's dog's vet's new girlfriend he just met totally suffered life altering consequences. The vast majority is bullshit, whether the person saying it knows it or not, and the remainder is such a small portion, it most likely doesn't make a significant difference from reported results and risks.

At this point, you're basically unable to think critically or discuss the negative. Being part of a herd also comes with some dangerous aspects.

No, I can do that. The problem is that critical thinking leads me to the realization that there's never any fucking evidence, at all, ever. Some schmuck that may or may not be AI with a username I've never seen before can write some words on social media about a thing that totally definitely happened to someone, but that's it, that's all it is. There's never unadulterated pictures or video. No medical records from the hospital visit such a severe reaction surely must have required. No articles from a respected journalist known to thoroughly vet sources. No medical or scientific studies that hold up to thorough scrutiny. Do some people have severe negative reactions? Yeah, the manufacturers literally warn us of them. Is it the huge threat that some people made it out to be? Almost certainly not according to the available legitimate evidence.