Ok but to actually answer the question just in case it helps someone at some point.

1. feigning eye contact: look at their nose. If they're close enough, figure out what color their eyes are. How many times have they adjusted glasses/hair/whatever but always stick to something above the neck so you don't look like a cracked out dragula butchering the conversation partner with your eyes.
2. aside from their voice, try to see what else you can hear and what's causing the noise. If it's annoying enough, take advantage of the next pause to mention needing to check out whatever it was.

I could.go on but my phone is about to die and honestly, ATLA had a spirit world monster that required absolute emotionlessness to face it without getting your face stolen so..I recommend trying to find at least that episode since it goes more in detail and stuff.

Also this is not meant to further one's desire for social withdrawal or other isolationist tendencies, nor is it intend for use with any illegal activities or otherwise harmful objectives. This is, at best, an attempt at acting advice,.emotional preservation assistance, and a wedge to drive between yourself island inherent toxicity of others. I really agree with almost everyone suggesting seeking out a professional, but I also understand that for one reason or another, that's not always an option for everyone. Instead, I suggest you use any advice given here for voiding emotional expression as an accessibility aid and not a strategy in and of itself. I hope this helps, and I sincerely hope things get better for you, OP:)