No.807
Soyteens are all chuds, which means they come from /pol/. /pol/ was at first designed to keep the chuddines from leaking into other boards, but the main mod of /pol/, Rapeape, pretty much took over 4chan after it was bought by the japanese nigger. Rapeape made all troony mods ACK themselves and that meant /pol/ won. However, 4trans is still heavily populated and moderated by the jannies that came to the chan for it's original purpose… which is to discuss anime. Many of these non-chud jannies are victims of the incel-to-trans pipeline and are literally the stereotype of a commiepedotroon. Imagine an obese trans woman - that's them. All 4chan mods eventually evolved into either being the trans woman or a basement-dwelling chudincel.
Anyways, the soycacas are the guys who created their own culture in chan's /qa/, and evolved into chuds who made their own artform - soyjaks. The reason they hate 4chan is the troony side of the chan's jannies rulecucked them into oblivion, especially because they raided so much. The result was a bunch of angry and bitter chuds who felt they were a separate culture from 4chan at this point migrating to a different site, and continuing what got them booted off 4chan in the first place: raiding boards like /a/ and /LGBT/. Now, what many 4chan users feel towards users of other sites (reddit, twitter, etc.) (a superiority complex and bitterness for likely being banned off them), soyposters feel towards the chan.
This is basically it.