>But I can deny that this is an element of anonymous image boards specifically and not part of the broader human experience. That happens everywhere, to everyone, online and off.
Sure, but a large role plays anonymity and the place in itself that fosters that behaviour.
> you dont fit with the culture, change or fit somewhere else.
Maybe I expressed myself wrong there, obviously I don't expect 4chan to change according to my will alone, I search for places that I like, and avoid those I don't agree with. Having different cultures is nothing bad, for example I like this place here specifically for it, and don't want it to change into change into 4chan for the sake of attracting more people.
There is a difference between coming to a place and expecting it to change to your will, and being a regular and not wanting it to change into something I am not used to from that place.
Regarding reddit, I was also talking about forums in general, and like you say, some parts of reddit have those rules in place, not all of them. Avoid places like that, and my point still stands, based on a username alone you're not much more exposed than someone posting on an imageboard. I brought up groupthinking exactly because some act like there are worlds between a forum and an imageboard when in reality that's not the case at all, up/downvoting is groupthinking on a larger scale, but like I said, you also have that on imageboards, only in another way and not as obvious, either way it's ignorant to argue about a definitive way of what is "above" in the end, it depends on so much context.