generally don't chitchat with strangers.

Except on the internet.

It doesn't cost anything in that situation not to talk, there's no negative to it.

There is opportunity cost.

But just to be clear, your position is “don’t be the first one talking if talking to strangers, unless absolutely necessary, it’s too risky.”?

If this is not your position, please state it again, because this is how I read the comment I’m replying to.

In either case, please state what you think “the negative” that you are risking, or risking for a person on their behalf.