Well, the Halloween goblin is both cultural appropriation and stereotyping. Green Goblin then taking that and using it as an expression of his personality is racial charicaturing.
I feel like the Green Goblin flies around and throws explosives. I think that many goblins could appreciate that and would consider him an honorary goblin.
"Bah. Your Spider-Man movies and TV shows have a so called 'Green Goblin' in them. Always portrayed by a human though! Maybe Peeper should dress up as a human. See how you like it"