That being said, I agree with some other commenters that a generalized disposition to not take offense strikes me as problematic and a little Spocklike. I am put in mind of Aristotelian ethics, wherein one is recommended to pursue the virtue of righteous indignation (that term had less baggage in Aristotle's time) in contrast to the opposite vices of irascibility and complacency.

In certain very specific cases, yelling at the top of your lungs and banging on the table might be the entirely correct thing to do in response to a person's actions or words, and the sense of offense you feel is useful, because it is what provides you the necessary motivation to do so.