I try to see the event from their perspective. I understand that people do certain things due to some reason. May be they cut you in the traffic because they were late for work. If that doesnt work, I ask myself - Why should I let someone else control my peace of mind? My peace is my own responsibility. If I let someone control that state, then I will never ever be peaceful.
Worst case scenario, things happen for us to learn something. The rude co-worker could be an opportunity for me to practice love. So its all for good. After all from a nonduality perspective, we are not separate
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Meditation and present moment awareness helps a lot. I highly suggest that.