First, I'd suggest reviewing your riding technique. It may be that you aren't optimizing your posibilities for reducing the frequency of getting cut off.
Second, I'd suggest learning some techniques for chilling out when it does happen. Believe me, I know the feeling of anger that results when you get cut off. But, the reality is, you aren't going to win any altercation with a car or truck. And you aren't going to make the driver understand that they were wrong.
No driver I know of will admit that they drive poorly. I know all other drivers drive like arseholes and I'm about the only driver out there that knows what they're doing. But these folks will not listen when I yell at them telling them that they need to learn how to drive better. They just get defensive and/or angry and blame ME for the event.
Best thing to do is prevent it, and if that doesn't work, try to laugh about it and shrug it off.