I broke down today in a public setting when someone deliberately attempted to annoy me because they enjoy my reactions when I get upset. My question is, how to deal with such things? Any hexbears who regularly deal with this or have suggestions on how to handle such situations? Am I just fucked with dealing with assholes?
Content Warning: self-harm
So, I get sensory overload pretty easily with seemingly small auditory cues, such as whistling, intermittent humming, low frequency vibrations (like from old AC units or fluorescent light bulbs). Someone I am forced to interact with on a daily basis decided they wanted to make me squirm today by whistling off-key repeatedly, loudly, and very near to where I was working. When I asked them to stop they continued to do it, kind of like a sibling who is bored and wanting to get some entertainment by driving the other party crazy. After 20 minutes of it I was getting to the point of distress, and I asked them to please stop because it was making me uncomfortable, and their response was to try and do it more loudly. I finally went to them and talked to them directly, face to face, and all but begged them to stop because it was making me uncomfortable and it was getting disrespectful, near tears at that point, and they rolled their eyes and said "Sorry you got triggered". The reality was that I was to the point of starting to scratch myself with my nails to distract myself because I was so distraught from the noise, something that I've come to understand happens when I'm starting to dissociate. I'm ashamed to say I dug my nails in enough to draw blood and leave marks, something I haven't done in a long while. Ended up leaking a few tears, which is really embarrassing and shameful for me when I'm not alone...
I have to work with this person every day, and I can't wear headphones/ play music/ do things to block them out like I normally would. I just got this job but I'm already to the point where my mental health is being trashed after just a few weeks.
Am I SOL? Anyone have anything that could help with this, even if it's suggestions on dealing with over stimulation in a work setting as someone with autism? I keep my ND a secret; no one knows I'm on the spectrum. ...am I overreacting? 
Do you want me to just keep spitballlng ideas? I’ve got some time and might as well help a comrade brainstorm if it’s something you’re finding useful. It’ll also bump the thread so if nothing else it’ll help people who might have the answer find it.
Idea: visual indicator that there’s a call and headphones with an easy to activate transparency mode (disclaimer: transparency modes make all the sounds that fuck with me infinitely worse so this could backfire if you’re similar in that regard assuming it’s even possible to swing the compromise).
No idea how to pitch it without telling them the truth as to why.
If you have ideas I'm all for hearing them, and even better if it gives other comrades some viable options if they're in a similar situation with less restrictions. I'm feeling pretty exhausted and might have to pass out soon, so I might not respond til tomorrow. The phones we use have headsets that are provided by the company and can't be swapped out, which I guess is why they don't allow headphones--maybe the assumption is that they'll get in the way of the headset or delay answering calls. I just assumed some old person complained about someone listening to music on the clock and they made it a rule. I like that idea though, had no idea there were headphones with transparency mode out there.
Yeah, the mode works by using the mic to detect sound and play it through the earbud. This makes some noises very painful.
I’ll reply with any ideas that come up. Sleep well comrade!
Thank you