As someone who once did exactly that to people exactly like you, I can tell you it goes deeper. We called it “Spanging”

Always get too close

Always look at a vulnerable spot of their body while speaking

Always be in their path

Always use kind words and inflections so they can't understand why they feel threatened

Always use sharp hand movements while speaking

Always make sure they know you're desperate (in the bad way)

Always compliment something about them to make them feel obligated to remain polite

And, if possible, point out how you recognize them just so they know their likely to encounter you again.

It's a purposely designed shakedown system. I'm not taking a stand against those who did/do it, I'm simply saying that we know what we're doing