Can kids be a ghost? Cutting two holes in a sheet might offend someone without sheets.
Pirate with a hook? Mocks amputees.
Nerd? Offends engineers
Princess? Offends serfs, or perhaps actual princesses
Jedi? Upsets Boba Fett.
US Marine? Upsets the Taliban.
I even had a kid show up at my door dressed as a fireplace one year, I guess that mocks people without heat.
The real problem with Halloween is that it used to be kids putting on something they thought was cool and getting some candy. It’s not anymore.