They need a good laxative, or cup of coffee, or hell perhaps even a hug or shoulder to cry on. Either way the foul mood is on them and people shouldn't let it bother them.
So in a way is their deprivation and frustration which brings them to this point where they use different excuses to vent out their frustration and anger at all be other place?
@xbandoleerx: It can be yes. The point is you just don't know what is going on in their life, and nobody can deal with every issue perfectly. We're human, we vent. It happens. Don't take it personally.