Possible Clues:

• Find it intolerable to receive birthday cards and no love letters
• Unpleasantness that comes with the sack?
• Often-anonymous intimidation technique
• Abusive messages blasted Thai meal
• "All round outstanding production of Hamlet" — adulation not expected in this?
• Form of intimidation
• Hostile message or greeting when new team is introduced?
• It's angry and often anonymous
• Spooner's friendly greeting is anything but
• Abusive letter that expresses loathing