People don’t make up you angry or upset, it’s what you think about their behaviors that truly upsets you.
The authors (Ellis, Lange) offer an approach that you can use to stop these types of upsets. You challenge your old unhelpful thinking, then replace it with helpful thoughts about the situation. As you practice this technique on “small” problems, you’ll develop skills to handle large problems and become more assertive in social situations as well.
These simple and straight-forward methods work to significantly lessen upsets caused, not so much by others, but your own thoughts about their behaviors.
An excellent book for self-help and professionals alike.