It's actually a choice whether we get offended or not. This may come as a surprise, considering our propensity to blame others for our decision to take offense. It's quite easy to take up a view that things should be THIS way, and anybody who violates my personal wish has offended me and deserves to feel bad about it! But people and situations will always violate our wishes of how things should be, then we have a choice - Equanimity or frustration.
"For a disciple who has conviction in the Teacher's message & lives to penetrate it, what accords with the Dhamma is this:
'The Blessed One is the Teacher, I am a disciple. He is the one who knows, not I." -