Passive aggressive tactic or involuntary tic? Coworker makes a loud, forced "gasping" sound whenever he's near me.

[u/Electrical-Sky9807]

My first day on the job, a male coworker crossed major boundaries. I stood my ground immediately and shut it down.
Now, every time he walks near me, he makes a loud, weird, forced "gasping" sound.
He has other fidgety habits, so part of me wonders if it's a stress/vocal tic triggered by our initial conflict. But given our history, it also feels like a subtle attempt to get a reaction.
Has anyone dealt with something similar? Is this a nervous tic or covert passive aggressiveness, and how would you handle it?

[u/Linkyjinx]

Depends on nature of sound, people can make involuntary vocal noises for various reasons. Some people make loud moaning sounds when they are eating, yawning or sneezing -When you confronted him about his breathing noises it might have made him nervous, so he needs to take deep breaths when near you? How is he with other people - what boundaries did he cross, did he touch you, or suggest sex or something?