That's the way they work. They talk shit nonstop until you feel like all hope and point is lost.

Don't let them win.

True story; I used to get cops to fuck off from harassing me by bringing up psychological/therapy topics with the cops. They are NOT equipped to deal with that shit at all. Same time, just try to be cool. Be firm but flexible. I dunno, some Bruce Lee quote here would be fitting but I can't think of any 😕