Simply sharing something from sources is different than sharing something from sources to add to your argument and being proven wrong due to fake info.
For example, if you just share a post you found that is funny, fake, satirical, interesting, etc that's fine. You are simply resharing what was already shared.
But if we're debating a topic, and then you add a post to backup your narrative which is then proven to be fake, that's different...it's deceptive.
Just like someone saying they are not homophobic, then using posts from known homophobes to back up their argument. That's more hypocritical than sharing fake info.