Most of the time if we do much besides keeping our heads down and going about our business, it creates more hassle than we really want to deal with. When someone takes an attitude with us, but it's not really a big enough deal to feel worth it, we just wonder what their problem is and move on.
And sure, in an ideal world, that's how it would work. Well, in an ideal world, they wouldn't have got in our faces in the first place, but whatever.
The point is that we're not in an ideal world and some days, our more petty sides can take over and we get an idea that's equal parts clever and evil.