To be clear, I am not "fostering [an] environment" or defending 4chan here at all, I am just pointing out that this is a misunderstanding of what the culture of 4chan is.
Like the person I was replying to, I somehow doubt you have spent any time there. Where on the site are you even talking about? /g/? /lgbt/? /k/? /mu/? /pol/? /bant/? /sci/? /b/? Even though they share the cultural features I was talking about, they are quite distinct otherwise. Many people read threads on a topical board like /mu/ or /g/ and haven't spent any time on the more offensive or stomach-churning parts of the site like /pol/ or /b/.
> Because not everyone is there just to have a fun time saying slurs
I resent this implication that merely because I suggest people understand the things they are talking about that I am on 4chan using slurs. This style of argumentation would be right at home on the worst boards of 4chan...
> it is an actual site of conversion and radicalization towards their goals
4chan is not a person, it doesn't have "goals" or opinions any more than heterogenous online communities like eg HN or Reddit do. I would agree that 4chan as a community does house more polarized opinions than most online communities, though that seems to be largely a function of not having upvotes and allowing anonymous posting.
To your overall point, that this is a value difference between myself and the GP, I fully disagree. I am making a factual (and not value-centric) claim that toxicity towards anyone posting on the site is an integral part of the culture there.