I think there is a clear distinction between a Halloween store, a fully decked out house with the music and the full decor, cobwebs, spiders, and other additional context is different than seeing a child-sized body hanging in a bunch of trees at a crosswalk used by children and no other contextual-building devices such as a Grandfather clock, Max's friends, Vecna, anything to say this is a character from that RIDICULOUSLY popular Netflix show, NOT a dead child. I think that is very reasonable.

That context may not be necessary for people who aren't immediately effected by what they see, for example the top comments mentioning how, upon closer inspection, they realized it was likely meant to be Max. It took time, time that people suffering loss or other traumas don't have, they'd see the body and instantly be brought back to their loved one with all of the feelings and pain at once. Building the context gives their mind time to say "Oh neat! Halloween decorations! Oh that must be from Stranger Things?... Not my jam, but I'm glad others are having fun." Rather than "Oh God! Is that child okay?!?" Which would be a sign of on-going awareness for dangers, parents, care-givers, doctors, teachers, crossing guards, etc. who are in charge of child safety, or be pushed back into old trauma.

If you saw a squished body on the pavement outside of a skyscraper with no context would that be a Halloween decoration or a tragedy? Context is KEY!