You know, such as the "violent coup attempt on January 6" and other stuff like that...
Just laugh... And say something like "My, you're delusional." Make fun of them.
I told one lefty "They should have set the capitol on fire, torn down the statues, looted the entire building, overturned and burned cars, and killed a couple of dozen people - then instead of an insurrection, it would've been a mostly peaceful protest."
The response included some words that don't belong in a family friendly forum like this.