Why does Halloween give all stripes of Catholics the heeby jeebies? Given the diversity of opinion among "Catholics" on fundamental matters like sexuality, doctrine, and the Sacraments, I am surprised never to have met in person a Catholic in favor of Halloween.
We know Trads do not like Halloween, given the absence of it (All Hallows' Eve) in the 1962 kalendar. Other Catholics do not like it either. I remember in October of 2010, when I was acting as a friend's Confirmation sponsor at University, the feminist who favored female "ordination" who taught RCIA gave everyone a copy of some biweekly flyer as a means of instruction (this was the method of instruction every week.... a four page pamphlet....). That particular week's was about how Catholics should reclaim Halloween by dressing up at St Thomas More and holding a fake head under one's arm!
Personally, I could not care less. Unlike other pagan practices such as Yoga and Hindu meditation, the non-Christian religious aspects of Halloween have gradually disappeared, at least here in the United States. Hindu meditation requires one to get in touch with one's inner "chakra." Dressing up as the Headless Horseman does not. Some stranger practices, like the Mexican Día de los muertos, do retain pagan aspects of ritual. In the Mexican ritual, one builds altars for the deceased and offers them food. This goes much further than lighting votive candles.
Were I married with children, I am not sure I would be trick-or-treating with my children, but I doubt I would be very bothered by others doing so.