In situations like this I use what I call “The Look” others have referred to it as “Crazy Guy” or as my beloved puts it “The Serial Killer Look”. I can’t tell you how to do It. It is a none verbal thing. A step into their space, a slight smile. and an,” when ever you are ready attitude” is my best guess.. No talking, no clever rebuttal, just the look. In 60 plus years It has worked every time.