Being offended offends less than giving offense. This can be seen as a kind desire to not cause others pain, or it can be seen as a narcissistic desire to be viewed as blameless.

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Long version:

A morally undeveloped boor who gives nothing but expects nothing from others can certainly be offensive, but be is not nearly as offensive as someone who gives but also expects things from others who cannot or will not give it. While former gives others no thought, the latter gives others unwanted thought, and that is worse.