Are you asking about a specific episode or community of toxic behavior that originated there but has found its way here? If so, then my answer is no. Granted, I haven't visited that other site in such a long time, I likely wouldn't know if some specific instance of toxicity here was actually related to something over there. Also, I mostly avoid the communities here that are named similarly to subs over there which always seemed to be a magnet for drama or poor behavior. Mostly.

But if you're asking in a more general sense, then my answer is yes(-ish). I have experienced and seen a fair bit of toxic behavior and numerous toxic users here. In many cases, the behavior and mannerisms mimic the toxicity I was used to seeing on the other site. So, I presume it's something that originated there and then subsequently migrated here, but I obviously couldn't say with complete certainty and absolute proof.

Granted, that's not unexpected, and as other folks have already commented, toxic people and toxic behavior are pretty pervasive and ubiquitous on social media sites.