Unthankfulness (Ungratefulness)
Damn man!!
I'm a patient person and also helpful. Please though, don't make me mad, don't spit on the plate which once you ate from and simply ignore it because it's not useful for you anymore. Don't simply turn yourself away like "I don't need you anymore" it's getting annoying and I am really mad.
One of the worst human behavior is the unthankfulness (ungratefulness)