If you think cycling is humbling, try riding out here. Imagine launching what you think is a blistering attack on a hill, only to have the watching kookaburras literally laugh at you!
In all seriousness though, there's no real shame in being passed, and there's no real reason to gloat to the world about passing someone either. Fact is, you just don't know their circumstances. I, for one, am a lot easier to pass after 250km than I am after 2.5km. Here endeth the lesson.