My advice = don't take it personal
If someone does something stupid, is driving like a d**k, or whatever, just stay well clear of them and don't take it to heart ... it's not just you they are p***ing off, it's probably every other road user too - don't worry - they'll eventually kill themselves
law of natural progression (or evolution, whatever you want to call it) LOL
If that fails, try taking up Yoga - supposed to be good for stress and if you ever DO get knocked off then at least your body should be in tip-top condition to help reduce injury and also to aid a speedy recovery
Pete