euphemisms gone awry
My guess is he’s probing for possible room-mates, and this is a setting I’d more than expect to hear this:
“Are you 4/20 friendly?” […] “4/20 Friendly?” […] “(sigh) Do you smoke marijuana?”
My best guess is that if you have to answer what ‘4/20 friendly means’, whatever they think of marijuana — whether negative or positive or even (probably infrequent) casual user…
the answer is no… they are not “4/20 friendly”.