I have no hate for Halloween. We have a similar tradition here in northern Germany called Rummelpott (rumble pot): At new years eve, the kids dress up, go from house to house making noise with their rumbling pot and singing a song asking for treats.

That custom does slowly fall out of fashion and gets replaced by Halloween, but I think the decline of Rummelpott started before and independently of the rise of Halloween, so no reason for hate.

The only thing I really dislike is the aggressiveness of Trick-or-treat. With Rummelpott it was great if you got a chocolate, but if someone couldn't give or didn't want to, it was fine as well. But on Halloween you're kind of extorted to give something. Some older kids have even committed malicious property damage with their "trick" part in the past, but I feel like that's gotten slightly better since the news started reporting the criminal charges some of these teens were facing.