How do you handle co workers making smart comments under their breath and making issues at work?

So I got into a disagreement with a co-worker who spent the day making smart comments to me and another co-worker all day some out loud and some under her breath. She started talking down to me, thinking I didn't hear her, so I spoke up for myself. I didn't think it would be an issues so I left it alone. So i get home, my boss texts me hey I've been getting concerans today about you putting Peanut butter in our Allergy free blenders."""""" I know right away it was my co-worker who said this because i heard her speaking under her breath, thinking i didn't hear her. My boss tried hiding the fact it was my co-worker ail who said this.

I explan to my boss what happened and told her I put the wrong label on a blender while alil was making smart comments under her breath towards me and our shift leader. I would never put prenutbutter in a clear blender they go in an orange blender. i come from a background of training people to make shakes at my old job. My boss did not reply back to any of my messages. We had someone who had an allergic reaction to smooth 3 days ago, which we don't know who made the smooth. I already figured out the issues everyone washes prenut butter smooths with the normal ones and even put the prenut butter tops with the normal ones.

I think it's highly like this is bow the consumer got sick. What would you do with a co-worker who acts like this? I also heard her talking under her breath about taking to a few shift leaders. So believe I will be single out at work now since I tend to be quite and respectful.
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I decided to just hand in my two weeks I know what I am worth and this jobs just holding me back. I always treat everyone with kindness and help my co workers when they need me
How do you handle co workers making smart comments under their breath and making issues at work?
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