My response would have been get lost homo. Go troll a road side mens room
Yeah, I would have immediately check to see if I had my gat with me, then I would have told the kid to get lost.. I've become Callused and probably way too bitter in my old age when it comes to the "zoomers".
I trust them about as much as they trust me...
Mine would have been "what are you selling?". Most people who are talking to me cold like that are either selling insurance, a multilevel marketing scheme or religion.

I would have expected him to ask if I know Jesus and try to convert me.
That’s a very sad response. We wonder why the world is becoming so cold, untrusting and divisive, now we have a hint. Why would your first response to someone wanting to talk to you be so dismissive? How depressing. It wouldn’t hurt to entertain his request. It wouldn’t take long to figure out his motives. If he just wanted to talk, you might learn something, if he was selling something or was just a jerk you could always end the conversation. Hopefully, politely.
I am reasonably good at reading body language and can take a good guess at someone’s motive in less than five seconds.
I can be very polite and friendly or mean and nasty—as called for in the specific situation.
You didn’t happen to write post #2, did you. It was deleted and it always makes me curious as to what it was.