I get them confused also; however, the FAA calls it “acrobatic” see title for part 23

Part 23 – AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES

Maybe they think they’re great at doing flic-flacks, or dangling from rings? Weren’t they used to assist in The Great Escape – wasn’t that a low flying brick they put over the hole?