^^^ Geez, and I thought everyone loved the Secretary of Transportation.
88 is only applicable to statements made by officers. 89 is only applicable to statements made at officers.
So technically, AFAIK, it's legit for enlisted to insult any government persons not in the chain of command. Except for Article 134, which makes anything or everything a crime. "All conduct of a nature to bring discredit upon the armed forces", which means whatever your CO wants it to be.