Yes, could be over-arousal thing (also an autism-spectrum thing, as noted above, but that's not saying that's where you are). I have cptsd and am hyper-sensitive to sound. If I start dissociating, every sense gets a little numb or blurry, except my hearing gets much more acute. Then if I can't get grounded, sounds start to get cluttered and chaotic and I get really confused. I've had to leave group situations because of this.
But also, I do just hate the sounds of people eating. I had a relative who I could NOT handle being around when they ate. Wild animal, like you say. But the main thing was my hearing was already over-sensitive and I was amped up (over-aroused). So it might be finding a way to cut back on general anxiety or over-arousal, if that makes sense. Allow yourself to wear ear plugs for a period if that's helpful. Get out of there during lunch and give yourself some quiet alone time (many times I appreciate leaving the group for lunch so I can get some quiet...even if to just step outside the building for a bit). Or allow yourself to take a short but mindful walk....or go to the bathroom and just have a minute of quiet. With the loud eating, it's also one of those things that once you notice it, it's hard to un-notice, unfortunately.
Sorry I don't know your story, but I'd mention to a doctor as well. I'm not a big fan of meds, but gabapentin (I'm taking for pain) has actually taken me down a notch in terms of tolerance for external chaos. For other people anti-anxiety meds and other things help. Or mindfulness practices.
I have to go easy on sugar. I also have a spikey ball I can squeeze or press with my feet. I amp up so easily. Letting out tension in little doses helps, as well as getting quiet when I can....and even just if a few minutes, really using it to help myself come back.