Very well said, Brian!
Agreed, for me I've seen various forms of gatekeeping. Some forms it's directed at teens/the event attracting teens. Other forms it's claiming the event has gone or going "family-friendly" just because it decided to have an IP that's not a R-Rated movie, or if it's a Horror-Comedy, or a TV-show, or heck, I've seen gatekeeping over things that arn't bloody. A lot of it can be boiled down to the toxic mentality of "If it's not what -I- think is "Horror", than -I- don't want them to have it."
A wonderful thing about Horror is it's a Baskin Robbin's of styles, subgenres and various forms of media. You've got slashers, psychological horror, horror comedies, slow burns, Cinéma vérité , stop motion, German Expressionism, anthologies, body horror, cosmic horror, horror which does it's darndest to emulate a snuff film. The list honestly goes on and on. On top of that, it's got a broad audience range as well. Horror has been introduced to people in so many ways, from Goosebumps and Are You Afraid of the Dark (as well as R.L. Stein's The Haunting Hour which get's pretty F'd Up at times), to films and shows that arn't explicitly horror. So for an event that's celebrating Horror, the gatekeeping has honestly be on the annoying/frustrating side. I feel the creative minds at A&D have done a great job giving a nice variety of Horror each year, it doesn't need jerkwads trying to push others aside and out because it doesn't match up with their views.