S: (n) insult, affront (a deliberately offensive act or something producing the effect of deliberate disrespect) "turning his back on me was a deliberate insult"
S: (n) presumption (a kind of discourtesy in the form of an act of presuming) "his presumption was intolerable"
S: (n) rebuff, slight (a deliberate discourteous act (usually as an expression of anger or disapproval))