How to be Insulting at Christmas: Turn up the television when the carol singers arrive and turn off the lights until they go away.
How to be Insulting in Hotels: If you have to get up early, do it with the maximum amount of noise. Run a bath loudly and sing in it.
How to be Insulting at Christmas: Try to duplicate presents wherever possible then lose the receipts so that none of them can be exchanged. If they happen to be things you want yourself, so much the better. Just offer to take them back.
How to be Insulting in Hotels: Call room service last thing at night, when the kitchens have just been locked, and ask for a cheese sandwich and a glass of fresh milk. Make sure that you leave them untouched and conspicuous the next morning.