I'm not offended at all. I have friends who have differing beliefs, and you would be surprised how many people celebrate Halloween in such a positive and spiritual way.
Heres a fun fact I learned: Trick or Treating was 'started' a long time ago when some people believed it was good luck for a stranger to come to your door to beg for a bit of food. Well, small villages didn't get many visitors. So to ensure everyone had good luck, they would wear disguises and beg for food at each others doors!
Dont mind me, lol, Im fascinated by little facts like this.