Try your best not to argue. It only adds to stress. Therefore try to solve your problems by allowing each other few moments alone so you can figure out what happened and if you were being reasonable. Also make sure you know how to appreciate when your roommate is being helpful, cooperative or understanding. Though you may choose not to hang out with your roommate or be as friendly with them as you are with your other friends, still it always pays to be empathetic. Lend her/him an ear when he/she is going through a problem provided they...

In short while trying to become a good roommate, I would like to remember the following rules:
Be polite and sympathetic

Don't impose yourself

Respect their space and privacy

Make it clear (though politely) that you would also want your privacy respected

Don't expect the other person to be sympathetic but don't let them push you around either Don't smoke, drink or bring guests into your room unnecessarily since it is 'Not' just your room.