That is the usual behavior of nlp models. There are a lot of secondary pieces of software running in chatbots to prevent them from getting really aggressive and the conversation is usually resetted after 5 mins or so.The bot got really argumentative, though which I thought it was interesting.
The exact reason is not fully known but they lack the capability to annotate data as truthful or not and their source is existing texts on the internet. Thus they likely just start using arguments humans use when you present them word patterns humans use while arguing.
