discourtesy, offense, offence, offensive activity

a lack of politeness; a failure to show regard for others; wounding the feelings or others

• derision, ridicule — the act of deriding or treating with contempt
• indelicacy — an impolite act or expression
• insolence — an offensive disrespectful impudent act
• insult, affront — a deliberately offensive act or something producing the effect of an affront
• presumption — a kind of discourtesy in the form of an act of presuming
• rebuff, slight — a deliberate discourteous act (usually as an expression of anger or disapproval)

• behavior, behaviour, conduct, doings — manner of acting or conducting yourself