system
A chat on subreddit /r/me_irl
human
4chan is a cesspool and save haven for far-right trolls.     
Reddit at least has a base level of moderation nowadays and most of the far-right subreddits got banned.

But every social media is toxic
gpt
4chan as a whole isn't tho 

If you don't want to see far right stay away out of /b/ and /pol/ and your're good to go