I have used it successfully myself
To de-worm yourself? Awesome, always good to be worm free.
I got a lot of hostile and ridicule and mockery
I don't condone hostility. But if you were a friend of mine and you claimed you cured Covid using ivermectin I would definitely mock you. Sorry bro.
what was an agenda of prejudice [against ivermectin for Covid]
Why do you think it was prejudice and not, y'know, post-judice? https://www.astralcodexten.com/p/ivermectin-much-more-than-y...
What's a simpler explanation?
"Ivermectin is really effective against Covid but the drug companies just want to make money so they're suppressing the truth"
OR
"Ivermectin is really effective against worms. Being worm-free is helpful in fighting Covid. If you don't already have worms it won't help you with Covid"
Did you have an open mind to both these explanations? Do they both seem plausible to you?
If you reject explanation 2 outright, maybe you're the one who's close-minded and hostile to new ideas?
If you agree both are plausible explanations, what was your framework to decide which one was true?