I have my doubts that the dude whose cunning plan was “chuck some shit at her during a town hall” had the wherewithal to get his hands on glacial acetic acid.

If the goal was disfigurement and he had the requisite knowledge to understand chem enough to use a pure acid, acetic would be a shitty choice over just buying drain cleaner. Sulfuric is way better at breaking down organic matter than acetic.